Beneath the Surface: What Morgellons Histology Shows—and What It Doesn’t

Morgellons disease is usually discussed as a disease of fibers. Under the microscope, however, the more difficult questions concern the skin producing, surrounding, or containing those structures. Published reports describe altered epidermal architecture, abnormal hairs and filaments, comedo-like masses, and thickened follicular casts. None of this proves why Morgellons patients experience stinging, pressure, crawling, or the persistent sensation that something must be removed from the skin. It does raise a question that dermatology has barely studied: what was present at the site before the patient began manipulating it?

The distinction matters because picking has become central to the medical interpretation of Morgellons. A patient repeatedly scratches, squeezes, or probes the skin, eventually producing an erosion or ulcer. When examined later, the lesion may show excoriation, hemorrhage, crust, secondary infection, and environmental fibers trapped in exudate. The patient may also present an unusual object removed from the site and describe it as a worm, shrimp, seed, cocoon, or plug.

Within the traditional psychiatric interpretation, the chronology appears straightforward. The patient first believes that an object or organism is beneath the skin, injures the tissue while searching for it, and then misidentifies ordinary biological debris or textile fibers as confirmation of the original belief.

Histology cannot always tell us whether that chronology is correct. A biopsy is a snapshot of tissue at the moment it is removed. If a lesion has already been manipulated for days or weeks, a pathologist can accurately identify trauma without necessarily reconstructing what the follicle, papule, or epidermis looked like when the patient first noticed it.

This is where the histology of Morgellons becomes more interesting than the familiar debate over whether a blue fiber is cotton.

What Is a Maculopapular Rash?

Before discussing fibers or follicular structures, patients need to understand one of dermatology’s most common descriptive terms: maculopapular.

A macule is a flat area of altered skin color. It may appear red, pink, purple, brown, gray, or simply darker or lighter than the surrounding skin. The important feature is that the color changes without producing substantial elevation. When a fingertip passes over a purely macular lesion, the surface may remain relatively level.

A papule is raised. It is a small, solid elevation that can usually be felt and may resemble an inflammatory bump, a tiny pimple, or an enlarged follicular opening. The word does not tell us what caused the bump. It describes its shape.

A maculopapular rash contains both flat areas of altered color and small raised lesions. In ordinary language, it is a blotchy or mottled rash with bumps. Its appearance can vary considerably with skin tone, inflammation, lighting, and the age of the lesion. On darker skin, a color change that appears bright red in a dermatology textbook may instead appear violaceous, brown, gray, or only subtly darker than the surrounding tissue. Sometimes the raised component is easier to feel than the discoloration is to see.

Maculopapular is a clinical description, not a diagnosis. Infectious diseases, drug reactions, immune disorders, and inflammatory dermatoses can all produce combinations of macules and papules. Two rashes that look broadly similar to the naked eye may show entirely different cellular changes under a microscope.

This distinction is particularly important in Morgellons because the disease is often represented by photographs of large chronic ulcers. The published Morgellons literature describes a wider range of lesions, including macules, papules, plaques, follicular lesions, hyperkeratotic areas, callus-like tissue, and ulcerations. The CDC-sponsored investigation of an unexplained dermopathy likewise documented papules, scars, plaques, patches, and macules among the patients it studied. [1]

A patient may therefore notice a patch of discolored skin containing tiny palpable bumps before anything resembling a chronic open lesion develops. Papules may appear around follicular openings. The surface may become thickened or scaly. Crust may form. With continuing inflammation, trauma, or an unresolved pathological process, the architecture of the lesion may continue to change.

In chronic ulcerative lesions that patients may describe as gumma-like, a familiar observation is the appearance of extremely fine filamentous material around the lesion margins and among tissue remaining in the center. The term gumma-like is used here descriptively; the Morgellons pathology literature has not established these lesions as true syphilitic gummas. To the naked eye, the filamentous material may look like clothing fuzz stuck to moist exudate.

That visual impression alone cannot determine what the material is.

When Tissue-Associated Filaments Look Like Fuzz

An exudative skin lesion is an excellent trap for debris. Serum, blood, fibrin, scale, and dried crust can collect lint, hair, textile fibers, and environmental material. The CDC-sponsored study documented cellulose compatible with cotton in patient specimens. The material was commonly found in superficial scale-crust, along tissue edges, separate from the tissue, or on the biopsy surface, and most of it produced no surrounding tissue reaction. [1]

This finding should not be minimized. Ordinary fibers really do adhere to damaged skin. The presence of a red, blue, black, or white filament on a lesion does not establish Morgellons disease, and color alone cannot distinguish a biological structure from a textile contaminant.

The more useful question is anatomical: where does the filament begin?

The important evidence is not that a fiber looks unusual. It is its structural relationship to the tissue.

Morgellons investigators have reported filaments beneath intact epidermis, embedded in epithelial material, or apparently arising in association with follicular structures. Mayne and colleagues described blue filaments photographed directly on skin at 500× magnification that appeared to arise from the infundibulum of a hair shaft. The smallest visible filament in the published image was approximately 2.5 microns in diameter. [2]

A structure only a few microns across is difficult to characterize with the naked eye. At ordinary viewing distance, a cluster of microscopic filaments around an exudative lesion may simply resemble fine fuzz caught in moisture. Under sufficient magnification, however, the observer may be able to follow an individual filament toward an epidermal layer, a follicular sheath, or an apparent point of attachment within tissue.

This is a fundamentally different observation from finding lint on a wound, although the two can coexist. A chronic lesion can collect cotton from clothing while also containing hair, keratin, collagenous tissue, and other structures originating from the patient’s skin. The presence of contamination does not establish that every visible filament is contamination, just as the identification of one tissue-associated filament does not transform every colored fiber on the lesion into a Morgellons filament.

The microscope is useful precisely because the naked eye is unreliable here. The important evidence is not that a fiber looks unusual. It is its structural relationship to the tissue.

What Has Been Reported in Morgellons Skin?

Histology examines the organization of tissue. The epidermis is not a uniform sheet. New keratinocytes arise near the stratum basale, mature through the stratum spinosum and more superficial layers, and eventually contribute to the keratinized barrier at the surface. Beneath the epidermis lies the collagen-rich dermis, containing fibroblasts, blood vessels, sensory structures, and the deeper portions of the hair apparatus.

Healthy skin depends on cells proliferating, differentiating, and producing structural proteins in an organized manner. Histopathologists use specific terms when that architecture changes.

Acanthosis describes thickening of the living epidermis, particularly the stratum spinosum. Spongiosis refers to fluid accumulating between epidermal cells and microscopically separating them. Hyperkeratosis is excessive thickening of the outer keratinized layer. Parakeratosis occurs when cells reach the skin surface while retaining their nuclei, indicating altered epidermal maturation. Psoriasiform hyperplasia describes a pattern of epidermal overgrowth resembling the architecture seen in psoriasis, although the pattern itself does not diagnose psoriasis.

Mayne and colleagues summarized Morgellons specimens showing combinations of acanthosis, spongiosis, psoriasiform hyperplasia, thickening of the granular layer, compact hyperkeratosis, and parakeratosis. [2] Middelveen and colleagues later classified selected lesions according to severity and reported increasing cellular disorganization, hemorrhage, inflammatory infiltration, macrophage involvement, fibrin, vacuolar or necrotic changes, and other histological abnormalities in more severe specimens. [3]

The CDC-sponsored study found a less specific pattern. Among 37 biopsied lesions, 15, or approximately 40%, showed histopathological changes compatible with excoriation or chronic irritation. Solar elastosis appeared in 19 specimens, and six contained features considered compatible with arthropod bite or drug reaction. The investigators concluded that the pathology was varied and largely nonspecific. [1]

These results describe different study populations and different approaches to the problem. The CDC investigation used a broad case definition centered on reports of fibers or materials emerging from the skin accompanied by lesions or disturbing cutaneous sensations. The Middelveen staging study selected 16 patients whose spontaneously developing lesions already contained embedded or projecting colored filaments and primarily examined thickened callus material removed from lesions showing that pathology. [3]

The CDC study therefore cannot tell us whether a narrowly defined filament-producing dermopathy has a characteristic histology. The Middelveen study cannot tell us how frequently its findings occur in the much broader population of people who identify as having Morgellons. Most importantly for the patient experience, neither study establishes the chronology between a localized abnormal sensation, the appearance of a follicular structure, and subsequent manipulation of the skin.

Some Morgellons Filaments May Be Malformed Hairs

The word fiber creates the impression that Morgellons filaments are one uniform object. The published microscopy suggests a more complicated collection of structures.

Middelveen and colleagues used histochemical staining and microscopy to report both keratin-containing and collagen-containing filaments associated with epithelial tissue. They proposed that altered activity of keratinocytes and fibroblasts could contribute to filament formation. [4]

The same study concluded that at least some colored Morgellons filaments and some translucent, or hyaline, filaments were abnormal hairs. Selected structures displayed follicular bulbs and scaling consistent with hair morphology. [4]

That finding is partly deflationary. A strange-looking filament is not necessarily a novel material. Hair affected by abnormal follicular growth may fail to resemble the familiar cylindrical shaft of healthy scalp or body hair. A flattened, twisted, irregular, or ribbon-like structure can appear synthetic under inexpensive microscopy while still being biological and follicular in origin.

At the same time, calling a structure an abnormal hair does not explain why it developed abnormally. Hair-shaft deformity is a dermatological finding, not an etiological conclusion. Similar structures need to be compared with hairs from other inflammatory, infectious, traumatic, and follicular disorders before they can be considered specific to Morgellons.

The same restraint should apply to collagen- and keratin-containing filaments. Their reported composition may help establish that selected structures are biological rather than manufactured textile fibers, but composition alone does not prove a spirochetal cause. It also does not establish that a microscopic filament produces the sensations reported by patients.

No Morgellons study has demonstrated that an individual microscopic filament activates sensory nerves. Considering how small some of these structures are, the characteristic fibers may be more important as markers of altered tissue production than as a direct mechanical explanation for the patient’s feeling that something substantial is lodged in a pore.

The larger follicular structures deserve separate attention.

The Comedo-Like Masses and Follicular Casts

To understand what Morgellons patients describe trying to remove, it is necessary to distinguish the microscopic characteristic filaments from much larger material associated with pores and hair follicles.

A hair follicle is not an empty hole in the skin. It is an epithelial structure that extends downward from the epidermis. The hair shaft develops within an organized system of follicular sheaths and normally grows toward the surface. Keratin, sebum, cellular debris, and hair all interact within a relatively confined anatomical space.

In ordinary dermatology, a comedo forms when keratinous material accumulates within a follicular unit. Follicular casts are sheath-like accumulations associated with the hair shaft. Neither comedones nor follicular casts are unique to Morgellons.

What is unusual in the Morgellons literature is the reported structure of some selected specimens. In a 2018 review, Middelveen, Fesler, and Stricker described hardened comedo-like masses appearing at pores spontaneously or after scratching. Some reportedly contained embedded or projecting keratin or collagen filaments. When filamentous material accumulated inside a pore or follicle, the authors described a “tight wad of fibers.” [5]

The same paper illustrated unusually thickened follicular casts. Gömöri trichrome staining was interpreted as demonstrating a keratin-rich outer portion with collagen-rich tissue internally. Another image showed what the authors described as a filamentous follicular cast with white filaments originating on the outer follicular sheath and growing in a coiled pattern. A further specimen was described as a thickened keratinized follicular cast growing inward into the dermis, accompanied by a clearly inward-growing hair. [5]

The evidentiary level of these observations is important. The 2018 paper is a review written by the same research group responsible for much of the affirmative Morgellons literature, and its discussion of lesion evolution includes observations from specimens examined by the authors, with related observations identified as unpublished data. The images are descriptive evidence. They are not a prevalence study establishing how often these structures occur in Morgellons or whether the same structures are absent from other follicular disorders. [5]

Even with that limitation, these structures are more relevant to the act of picking than the nearly microscopic colored filaments commonly associated with Morgellons.

Comedo-like masses and thick follicular casts can be large enough to see without the magnification needed to characterize a 2.5-micron filament. They may fill or emerge from a pore as a discrete object. This distinction helps explain the language patients use. An elongated cast can look worm-like. A curved mass may resemble a tiny shrimp. A rounded plug may look like a seed. A structure with a firmer exterior surrounding more pliable material may be called a cocoon.

These comparisons are not taxonomic identifications. A patient saying “worm” does not establish helminth infection, and a patient saying “shrimp” is not claiming that a crustacean developed in the dermis. The words may simply describe shape, texture, or the startling appearance of material removed from a pore.

The reported keratin-rich exterior and collagen-rich interior are particularly interesting in this context, but the distinction between histology and patient observation must remain clear. Gömöri trichrome staining identifies tissue components; it does not measure softness. Patients may describe a soft or pliable center enclosed by a tougher sheath, but the published staining does not prove that the collagen-rich interior is mechanically soft. The apparent correspondence is a question for direct study rather than a conclusion already established by microscopy.

The larger issue is that these structures are closer to what many Morgellons patients say they are actually picking at. The characteristic microscopic filaments may define the visual phenotype emphasized in Morgellons research, but a person repeatedly working at one specific pore is often not attempting to extract a microscopic blue filament. The patient is trying to release a visible or palpable mass.

That object should be characterized before the patient’s interpretation of it becomes the focus of diagnosis.

Do Follicular Structures Cause Morgellons Sensations?

The existence of an unusual structure and the sensation of an unusual structure are two different scientific questions.

No published Morgellons study has directly shown that a comedo-like mass, thickened follicular cast, malformed hair, or filament activates sensory nerves. Researchers have not prospectively identified a specific structure in a symptomatic follicle, recorded the patient’s sensation, removed the structure under controlled conditions, and demonstrated that the sensation resolved. No study has measured nerve activity surrounding one of the reported follicular casts.

For that reason, the published pathology does not establish that follicular casts explain picking, formication, or the sensation of a foreign body beneath the skin.

It does expose a missing step in both major interpretations of Morgellons behavior.

The psychiatric model often assumes that an abnormal sensation or false belief appears first. The patient then manipulates healthy or mildly irritated skin until a lesion develops. Keratin, blood, crust, hairs, and environmental fibers are subsequently interpreted as objects that had been hidden beneath the skin.

There is evidence compatible with this sequence. In the Pearson study, 40% of biopsied lesions showed histopathological evidence of excoriation or chronic irritation, and cellulose compatible with cotton was identified in numerous specimens. [1]

But a biopsy performed after manipulation cannot necessarily show that nothing abnormal preceded the manipulation. Excoriation proves that skin has been repeatedly injured. It does not reveal what the patient saw or felt at that precise site before scratching began.

The follicular hypothesis contains the reverse temptation. Once an abnormal cast or comedo-like mass has been photographed, it is easy to infer that the structure must have produced the sensation and caused the patient to pick. The published Morgellons studies have not established that chronology either.

The distinction is important because the resulting lesion may look similar under both scenarios. A patient can transform a small papule, blocked follicle, or localized inflammatory site into a bleeding erosion through persistent manipulation. Continued trauma can enlarge the injury, introduce bacteria, delay wound healing, and eventually obscure the structure that originally drew attention to the site. Conversely, a patient who begins with no significant follicular abnormality can also create substantial pathology through repeated probing.

Looking at the final ulcer does not necessarily tell us which sequence occurred.

The question worth studying is therefore not whether picking damages Morgellons skin. It clearly can. The question is whether prospectively observed symptomatic sites sometimes contain a physical abnormality before repeated extraction attempts begin.

The Secondary Syphilis Comparison Has Limits

The Morgellons staging literature makes an unusually direct comparison with secondary syphilis. Middelveen and colleagues wrote that “MD lesions are comparable to secondary syphilitic lesions” and proposed that, when Morgellons symptoms are present, disease progression in most patients is comparable to the secondary stage of syphilis. [3]

The analogy is useful when discussing clinical morphology. Secondary syphilis can produce macular, papular, follicular, psoriasiform, pustular, crusted, and other cutaneous presentations. Histologically, it also lacks one feature that appears in every biopsy. A multicenter review found that combinations of endothelial swelling, interstitial inflammation, irregular acanthosis, and elongated rete ridges should raise the possibility of syphilis. [6]

Secondary syphilis therefore demonstrates that one systemic disease process can produce very different-looking lesions. Gross morphology alone may not reveal a shared cause.

The analogy cannot establish Morgellons etiology, and it should not be mistaken for a claim that the Morgellons patients in the staging cohort had syphilis. The authors explicitly stated that they had not detected Treponema pallidum in any Morgellons subjects to date. Fourteen of the 16 subjects in the staging cohort were tested by PCR for T. pallidum DNA, and all 14 were negative. [3]

The comparison is therefore conceptual and pathological, not a finding of treponemal identity. Middelveen and colleagues compared two proposed systemic spirochetal disease processes and used the clinical variability and staged progression of syphilis as a model for organizing Morgellons lesions.

That distinction also clarifies the limits of the comparison. Syphilis has a proven causative organism, established diagnostic methods, and an extensive independently reproduced literature. Morgellons does not have comparable scientific consensus. The secondary syphilis comparison is an interpretive framework proposed by Middelveen and colleagues; the absence of T. pallidum in the tested Morgellons cohort makes clear that morphological similarity is not evidence of treponemal identity.

The flexibility of the analogy creates another weakness. A disease known as a “great imitator” can demonstrate how one infection produces diverse lesions, but a sufficiently broad morphological comparison can accommodate almost any variable collection of macules, papules, plaques, follicular eruptions, and ulcers. Similarity in appearance therefore has limited etiological value unless supported by independently validated microbiological evidence.

In the 2020 staging paper, the authors reported that they observed a “significant spirochetal burden” in all Morgellons dermatological specimens submitted for study. The wording is theirs. The methodological qualification must travel with the claim. The rabbit anti-Borrelia burgdorferi polyclonal antibody used for immunohistochemistry was reported by the authors to cross-react with Treponema pallidum, Borrelia hermsii, and Borrelia parkeri. The investigators state that a broadly reactive stain was intentionally selected to detect a wider spectrum of potentially involved spirochetes. They also examined normal skin and other control specimens and separately reported serological or molecular evidence of Borrelia in the cohort. [3]

The immunostain itself, however, was not species-specific. The claim that all studied lesions carried a spirochetal burden should not be paraphrased as though one specific Borrelia species had been independently demonstrated in every tissue section.

A Small Evidence Base With a Concentration Problem

Any serious discussion of Morgellons histology must acknowledge the concentration of its affirmative evidence.

Many of the most frequently cited reports concerning tissue-associated filaments, keratin and collagen composition, abnormal hairs, comedo-like masses, follicular casts, anti-Borrelia staining, and the secondary syphilis comparison come from overlapping groups of authors. Middelveen and Stricker recur throughout much of this research, alongside Mayne, Fesler, and other collaborators.

This does not invalidate the observations. Neglected fields often begin because a small number of investigators are willing to study a subject that larger institutions avoid. It does mean that several papers from overlapping authors should not be represented as several independent research programs converging on the same conclusion.

The 2020 staging paper also contains a direct financial conflict-of-interest disclosure relevant to part of its diagnostic evidence. Coauthor Jyotsna Shah was president and a stock owner of IGeneX Inc. The study identifies IGeneX as the laboratory performing its Western blot assays for antibodies reactive to B. burgdorferi and relapsing-fever Borrelia, and IGeneX also performed multiplex PCR for those organisms in clinical samples. The paper separately disclosed that Raphael Stricker owned Union Square Medical Associates. [3]

A disclosed financial interest does not make a laboratory result false, nor does a coauthor’s ownership interest automatically invalidate testing performed by that laboratory. It does make independent confirmation particularly important. When evidence of infection partly depends on testing performed by a commercial laboratory whose president and stock owner is also a coauthor, replication by laboratories with no financial or clinical interest in the proposed disease model would substantially strengthen confidence in the result.

There is an additional reason to insist on independent reproduction. Raphael Stricker, a recurring author in the Morgellons research program, has a documented research-integrity history unrelated to Morgellons. A June 25, 1993 NIH Guide notice reported that a University of California investigation found Stricker falsified AIDS research data by selectively suppressing findings that did not support his hypothesis and suppressing control data. The Office of Research Integrity concurred with the university’s finding. The notice states that the falsified data were used as the basis for an NIH grant application and that Stricker entered a three-year Voluntary Exclusion and Settlement Agreement. [7]

That 1993 finding does not establish misconduct in the Morgellons papers. Using it to dismiss every image or tissue section associated with Stricker would substitute biography for scientific analysis. The appropriate response is more demanding rather than more dismissive: important Morgellons findings need to be reproduced by investigators who are independent of the original research network.

The same critical standard applies to the CDC-sponsored investigation. Government involvement does not make a study immune from limitations. Pearson and colleagues used a broad case definition that may have combined patients with different dermatological and psychiatric processes. A biopsy taken from an established excoriated lesion cannot necessarily reconstruct the lesion’s earliest stage.

Conversely, selecting only patients whose lesions already contain embedded or projecting colored filaments makes it easier to study those structures but prevents researchers from estimating their frequency in a broader patient population. The Middelveen staging cohort of 16 patients was constructed around the physical finding the investigators considered characteristic of Morgellons. [3]

One research program may have sampled too broadly to isolate a specific filamentous dermopathy. The other may have sampled so narrowly that its findings cannot be generalized. Both limitations matter.

The Study Morgellons Histology Still Needs

The most useful next study would begin before the lesion is repeatedly manipulated.

A patient reporting a new, highly localized sensation should have the precise site photographed at ordinary scale and examined with dermoscopy or sufficient optical magnification to visualize the follicular opening. The appearance of any macule, papule, scale, crust, filament, comedo-like structure, or follicular cast should be documented before extraction.

If a visible mass occupies a pore, its size and relationship to the follicle should be recorded. Magnification should determine whether associated fine filaments rest on the surface, lie in exudate, or appear continuous with tissue. Only after this documentation should the mass be removed under controlled conditions.

The extracted structure can then be sectioned and stained. Its distribution of keratin and collagen can be mapped. Hair morphology can be examined. Structural methods can determine whether filamentous material is biologically organized or environmentally derived. If an infectious mechanism is proposed, species-specific molecular methods, appropriate positive and negative controls, blinded processing, and independent laboratories should be used.

The intact follicular site is equally important. When ethically and anatomically appropriate, tissue surrounding the original structure should be studied rather than examining only an object after a patient has placed it in a container. Researchers need to know how the cast or mass related to the living follicle.

Finally, the patient’s localized sensation should be documented before and after removal. Did pressure change? Did stinging remain? Was the sensation unaffected? Are similar structures present in asymptomatic follicles from the same patient?

Control groups are essential. Patients with acne, pseudofolliculitis, follicular hyperkeratosis, eczema, chronic pruritus, prurigo, trichotillomania, and repeatedly manipulated skin may also produce unusual follicular material. Unless Morgellons-associated casts are compared with these more common conditions, an abnormal-looking structure cannot be assumed to be disease-specific.

Such a study would not begin by asking whether the patient correctly identified a worm or parasite. It would begin by characterizing the tissue and establishing chronology.

What Morgellons Histology Shows—and What It Doesn’t

The histology of Morgellons disease remains unsettled. There is no independently established diagnostic biopsy pattern, no consensus that all reported filaments arise through one mechanism, and no direct evidence that follicular casts or comedo-like masses activate nerves or cause the sensations that lead patients to manipulate their skin.

There are, however, physical observations that deserve better investigation. Selected Morgellons specimens have contained filaments associated with tissue rather than simply resting on the surface. Histochemical studies have reported keratin- and collagen-containing structures. Some filaments appear to be malformed hairs. Comedo-like masses and thickened follicular casts have been photographed and described, including casts with reported keratin-rich outer tissue and collagen-rich interiors.

Those findings do not establish a sensory mechanism. They also do not justify assuming that every patient who probes one particular follicle began with anatomically normal skin and an imaginary object.

Picking unquestionably damages tissue. A patient can turn a papule into an erosion and an erosion into a chronic ulcer. Repeated manipulation can introduce infection, produce hemorrhage, delay healing, and fill an exudative lesion with environmental fibers. The pathology of trauma is real.

But identifying trauma in the final lesion does not, by itself, establish the condition of the follicle before the trauma began.

That is the unresolved question at the center of Morgellons histology. It can be investigated without accepting a patient’s belief that an extracted object is a parasite and without dismissing the object because the patient used the wrong word to describe it.

Examine the intact site. Document the follicle before extraction. Characterize what comes out. Compare it with appropriate controls. Then ask whether the sensation changes.

Before medicine decides why Morgellons patients pick, it should establish what, if anything, was there before the picking began.

References

1. Pearson ML, Selby JV, Katz KA, et al. Clinical, Epidemiologic, Histopathologic and Molecular Features of an Unexplained Dermopathy. PLOS ONE. 2012;7(1):e29908.
2. Mayne P, English JS, Kilbane EJ, et al. Morgellons: a Novel Dermatological Perspective as the Multisystem Infective Disease Borreliosis. F1000Research. 2013;2:118.
3. Middelveen MJ, Martinez RM, Fesler MC, et al. Classification and Staging of Morgellons Disease: Lessons from Syphilis. Clinical, Cosmetic and Investigational Dermatology. 2020;13:145–164.
4. Middelveen MJ, Mayne PJ, Kahn DG, Stricker RB. Characterization and Evolution of Dermal Filaments from Patients with Morgellons Disease. Clinical, Cosmetic and Investigational Dermatology. 2013;6:1–21.
5. Middelveen MJ, Fesler MC, Stricker RB. History of Morgellons Disease: From Delusion to Definition. Clinical, Cosmetic and Investigational Dermatology. 2018;11:71–90.
6. Flamm A, Parikh K, Xie Q, et al. Histologic Features of Secondary Syphilis: A Multicenter Retrospective Review. Journal of the American Academy of Dermatology. 2015.
7. National Institutes of Health. Final Findings of Scientific Misconduct. NIH Guide for Grants and Contracts. NOT-93-177. June 25, 1993.

Medical disclaimer: This article examines published research and unresolved questions concerning Morgellons disease. It is intended for education and scientific discussion and does not establish a diagnostic, infectious, or sensory mechanism. New, worsening, painful, or infected skin lesions require appropriate medical evaluation.