Modern case definitions and clinical discussions often combine visible lesions with crawling, stinging, or biting sensations. In the CDC-led study, a lesion was optional once reported material and a disturbing skin sensation were present.[1] That framing can leave something historically central underexamined: the skin itself. The lesions can be visually striking and, in some patients, recurrent enough to look characteristic. But recognizing a pattern of damaged skin is not the same as knowing what initiated it.
Some patients describe clinicians forming an impression before close examination—sometimes summarized as recognition “from across the room.” The phrase captures a real feature of dermatology. Distribution, repetition, scarring, pigmentation, crusting, and lesions at different stages can form a recognizable visual pattern before a dermatoscope or microscope is used.
That impression is easy to overstate. A clinician may recognize an excoriation pattern from across the room. That observation does not reveal whether picking began as a compulsion, a response to itching or neuropathic sensation, an attempt to remove a follicular plug, a reaction to an underlying skin disease, or a consequence of a fixed belief about infestation. It certainly does not establish that every lesion was created by the patient.
The central distinction: Skin morphology can show what has happened to the tissue. It cannot, by itself, establish what started the process.
Two Histories That Are Often Blended Together
The history of Morgellons is usually told as one continuous story beginning in the seventeenth century. That is misleading. There are really two histories: an old name revived for a modern illness, and a separate dermatologic history of lesions caused or altered by repetitive scratching and picking.
- 1690 publicationAn old name, not a modern diagnosisThomas Browne described children in Languedoc who broke out with “harsh hairs” on their backs. The passage does not supply a modern case definition and does not prove continuity with present-day Morgellons.
- 1875 onwardNeurotic excoriation and acne excoriéeErasmus Wilson used “neurotic excoriation” in 1875; Brocq described acne excoriée in 1898. A broader literature on psychogenic excoriation and pathological skin picking followed.
- 2001–2002Modern Morgellons centers skin findingsMary Leitao applied the old name after observing a persistent lesion and fibers associated with her young son’s skin; a later history written by proponents of the physical-disease hypothesis also recounts his complaint of “bugs.” The lesion and fibers were central, but sensation was present too.
- 2006–2010Early Morgellons cohortsSelected case series emphasized slow-healing lesions, shallow ulcers, fibers, plugs or particles, and pigmentary scars, along with crawling and itching.
- 2012–2013Mainstream comparison with delusional infestationThe CDC-led study found no shared infectious cause and documented excoriation or chronic irritation in 40% of biopsied lesions, while stopping short of deciding whether the presentation was new or an existing condition. DSM-5 separately recognized excoriation disorder in 2013.
- 2025 reviewNo agreed Morgellons standardA systematic review found no standardized diagnostic criteria, no validated biomarker framework, and no randomized controlled treatment trials for Morgellons.
Browne’s passage, written in the seventeenth century and published in 1690, described a pediatric regional illness involving hair-like eruptions, coughs, and convulsions.[2] It is historically interesting, but the name is the clearest connection to modern Morgellons. Treating that passage as a documented description of today’s condition creates a lineage the evidence cannot support.
The history of skin picking is more clinically relevant to the “across the room” idea. Erasmus Wilson used the term “neurotic excoriation” in 1875; in 1898, Brocq described acne excoriée, in which acne lesions were repeatedly picked until they became more conspicuous.[3] Later terms included psychogenic excoriation, dermatillomania, and pathological skin picking. A 2001 clinical review described the classic appearance as linear erosions, scabs, and scars—often hypo- or hyperpigmented—clustered on exposed areas the hands can reach.[4]
That visual pattern is real. So is the risk of turning it into a shortcut. A 2012 case report described a 53-year-old woman with schizophrenia who denied causing her lesions but was diagnosed with neurotic excoriations during three separate hospital admissions. Biopsy, direct immunofluorescence, and salt-split skin testing ultimately supported bullous pemphigoid.[5] One case does not establish how often this happens, but it shows why psychiatric history cannot substitute for a dermatologic workup.
What a Doctor May Recognize From Across the Room
Dermatology is a visual specialty. A distant first impression may be useful because some patterns involve the whole body rather than one lesion. Multiple marks of similar size, lesions in several stages of healing, crusted erosions, pigmentary scars, and concentration on accessible areas can strongly suggest repeated manipulation.
What may be recognizable
- Multiple erosions, ulcers, crusts, and scars at different stages
- Post-inflammatory hypopigmentation or hyperpigmentation
- Similar shapes repeated across accessible areas
- Signs of chronic rubbing, scratching, reopening, or removal
What that view cannot establish
- Whether a primary lesion existed before it was touched
- Whether itching, pain, dysesthesia, or a plug triggered the behavior
- Whether infection, neuropathy, inflammation, or another disease is present
- Whether a fiber is embedded in tissue or attached to surface crust
- Whether the person meets criteria for excoriation disorder or delusional infestation
The same lesion can carry two histories. It may have begun as a papule, pustule, follicular plug, arthropod reaction, inflamed nerve sensation, or small wound. Repeated inspection and extraction can then enlarge it, alter its border, introduce environmental fibers, and create a chronic ulcer. At the appointment, the secondary damage may be obvious while the initiating lesion has disappeared.
This is why “the lesions look picked” is an observation, not a complete diagnosis. It may be accurate and still leave the most important question unanswered: why was that site picked?
Dermatology literature calls one reach-related distribution the butterfly sign: relative sparing of the central back where the hands cannot readily reach. The sign was originally described in generalized pruritus associated with chronic jaundice.[6] It has also been reported with chronic itch from other dermatologic and systemic causes.[7] It is evidence about access and scratching, not proof of why the skin itched.
Morgellons Was Not Introduced as Sensation Alone
The modern Morgellons label emerged around 2001–2002 after Mary Leitao reported a persistent lesion and fibers associated with her son’s skin; accounts, including a history written by proponents of the physical-disease hypothesis, also describe him complaining of “bugs.”[8] Early papers and patient descriptions combined several features: nonhealing or recurrent lesions, fibers or particles, disturbing sensations, fatigue, cognitive complaints, and other systemic symptoms. The precise mix varied, but the visible skin complaint was not incidental.
Video context: Morgellons: Is it Delusional? is a recorded conference presentation by veterinary microbiologist Marianne Middelveen, uploaded by the Charles E. Holman Morgellons Disease Foundation (CEHF). The CEHF is a Morgellons advocacy organization that supports research, education, diagnosis, and treatment. Middelveen has published extensively in support of a Borrelia-associated hypothesis; the video is included for her examination of the delusional interpretation, not as proof that one cause has been established.
An early 2009 case series drew 25 participants from 30 consecutive self-identified patients. Its eligibility criteria included being convinced of chronic parasite infestation. About 70% reported recurrent painful shallow ulcers, and most said they could distinguish those ulcers from excoriations they had produced.[9] That distinction was participant self-report, not an independently observed chronology.
A 2010 retrospective convenience sample included 122 patients seen in the first author’s San Francisco office. “Clinically confirmed” meant that the first author visualized microscopic subcutaneous fibers with a handheld lighted 60× magnifier. The cohort reported slow-healing lesions and hyperpigmented scars.[10] The statement that there were “no excoriations or secondary infections” appears in the caption to Figure 1, a photograph of one patient’s lower legs supplied by Cindy Casey of the CEHF; it was not a cohort-wide finding. The abstract’s statement that pre-existing delusional disease “was not reported” likewise does not mean a structured psychiatric assessment ruled it out.
These reports involved selected patients, lacked population controls, and came from investigators supportive of Morgellons as a distinct physical disease. The 2009 series also relied on self-reported chronology and began with a belief-based eligibility criterion. Later filament and Borrelia studies—including a four-patient tissue series—came from overlapping investigators.[11] The 2025 systematic review found no validated biomarker framework.[12] These limits prevent the reports from establishing one cause, but they do document a lesion- and filament-centered research definition rather than formication alone.
What the CDC Study Added—and What It Did Not Settle
The CDC-led Kaiser Permanente study used a broader case definition: fibers or other solid material reported as emerging from the skin, together with a lesion and/or a disturbing skin sensation. A visible lesion was therefore optional, allowing people with different presentations into the same cohort.[1]
Among 37 biopsied lesions, the most common finding was solar elastosis in 19 (51%). Fifteen of 37 (about 40%) showed histologic evidence of excoriation or chronic irritation such as lichen simplex chronicus or prurigo nodularis. Another six (16%) had features consistent with an arthropod bite or drug allergy.[1] Solar elastosis primarily reflects cumulative sun damage, while the other categories point in more than one direction.
- They confirm that chronic manipulation or irritation was present in a substantial portion of sampled lesions.
- They do not show that every lesion was self-created.
- They do not reveal whether sensation, inflammation, a primary lesion, or a belief led to the manipulation.
- They show why a cohort defined by complaints rather than standardized morphology can contain several different processes.
The same evaluation found cognitive impairment in at least one tested domain in 23 of 39 participants (59%) and clinically significant elevations on the Personality Assessment Inventory in 25 of 40 (63%), with somatic concerns the most frequent elevation. Hair testing detected at least one drug in 20 of 40 participants (50%). Detected classes included drugs that may be prescribed, such as benzodiazepines and opiates, as well as illicit drugs; the paper did not distinguish prescribed from nonprescribed use. The investigators noted that drug use—prescription or illicit—and drug withdrawal can contribute to formication, but they could not determine whether detected use caused symptoms, represented an attempt to treat them, or was unrelated.[1]
The investigators were “not able to conclude … whether this unexplained dermopathy represents a new condition … or wider recognition of an existing condition such as delusional infestation.”[1] That is not the same as classifying every participant as delusional, and the biopsy findings themselves were heterogeneous. For a detailed breakdown, see What the CDC Morgellons Study Actually Found.
Skin Picking Is Real—and Frequently Misunderstood
Calling a lesion “picked” can sound accusatory because the word is often used as if it ends the investigation. In reality, skin picking describes several different phenomena.
| Possible process | What may happen | What still needs investigation |
|---|---|---|
| Automatic or habitual picking | The person manipulates minor irregularities, sometimes with limited awareness. | Triggers, frequency, impairment, and whether criteria for excoriation disorder are met. |
| Picking driven by itch or dysesthesia | A genuine crawling, burning, stinging, or itching sensation leads to scratching or extraction. | Dermatologic, neurologic, medication-related, metabolic, and psychiatric causes of the sensation. |
| Picking at a primary lesion | A papule, plug, crust, pustule, or nodule exists before manipulation. | The original morphology, distribution, culture, biopsy, and response to ordinary treatment. |
| Picking driven by a fixed explanation | The person repeatedly searches for or removes material believed to be infectious or parasitic. | Whether the belief is fixed despite evidence, and whether a medical condition coexists. |
| Repeated wound care or debridement | Attempts to clean a lesion become excessive and delay healing. | Whether clinical wound care, infection treatment, or behavioral support can interrupt the cycle. |
Excoriation disorder is not diagnosed from lesion shape alone. DSM-5 criteria require recurrent picking that produces lesions, repeated attempts to reduce or stop, clinically significant distress or impairment, and exclusion of substances, medical conditions, and other mental disorders. Criterion E specifically excludes picking better explained by delusions or tactile hallucinations in a psychotic disorder.[13] Excoriation disorder and delusional infestation are therefore not interchangeable labels. A patient can have manipulated lesions without meeting either diagnosis, and a separate skin disease can coexist.
How Sensation Came to Dominate the Conversation
The “and/or” in the CDC case definition matters. Because a disturbing skin sensation could substitute for a visible lesion once material was reported, one influential investigation grouped visible dermatosis with symptom-only presentations.[1] That design was defensible for a broad investigation, but it also helped separate the Morgellons discussion from any single lesion morphology.
Delusional-infestation literature naturally emphasizes belief and sensation: crawling, biting, stinging, and the conviction that an organism or material is present. Skin damage is often interpreted as secondary to attempts to remove the perceived cause. That framework also influenced how Morgellons entered mainstream dermatology.[14]
There are valid reasons to ask about sensation. Formication and dysesthesia can be severe, can drive tissue damage, and can arise from neurologic illness, medication effects, substance use, systemic disease, anxiety, obsessive-compulsive phenomena, or delusional infestation. But sensation is among the least specific parts of the presentation. It cannot distinguish these possibilities by itself.
Visible lesions offer a different kind of evidence. Their distribution, stage, borders, centers, follicular relationship, scarring pattern, and response to treatment can narrow a differential diagnosis. A plug inside a crater is not the same observation as a loose fiber on an open wound. A filament beneath apparently intact skin is not the same specimen as lint collected from a dressing. A lesion photographed before touching is not equivalent to the same site after repeated extraction.
Patients also describe recurrent combinations of hypopigmented and hyperpigmented marks, raised or ridged borders, white nodules or plugs within ulcerations, purple discoloration, and cup-like depressions after material is removed. These details may be highly consistent within one patient and deserve careful documentation. Research has not established that this collection is pathognomonic for Morgellons, however. Similar elements can occur in prurigo nodularis, lichen simplex chronicus, follicular disorders, secondary infection, acne excoriée, chronic wounds, and acquired perforating disorders.
That is why morphology should be restored to the conversation without turning appearance into certainty. The comparison with perforating disease is explored in Reactive Perforating Collagenosis vs. Morgellons, and a broader differential appears in How to Rule Out Lookalikes Without Dismissing Patients.
The Better Question Is: What Came First?
The argument over whether lesions are “spontaneous” or “self-induced” often becomes moral rather than medical. Chronology is more useful. A person may experience a genuine sensation, observe a small structure, manipulate it, and then develop a wound that becomes infected or chronically inflamed. Every step can be real even if the person’s explanation for the first step is unproven.
Information that preserves the lesion’s history
- Photograph a new finding before touching it, when medically safe.
- Document a new finding once rather than repeatedly; bring a few representative photographs instead of a large set.
- Record whether pain, itch, crawling, a visible bump, or discoloration appeared first.
- Include one image showing location and scale, plus a close view in ordinary lighting.
- Note whether the center contains a plug, crust, pustule, nodule, opening, or attached filament.
- Record products, adhesives, dressings, tools, and topical treatments used before the photograph.
- Ask whether culture, dermoscopy, or biopsy of an active and minimally manipulated lesion is appropriate.
- Document what improves or worsens healing without treating response as proof of a cause.
Use the complete Morgellons symptoms and documentation guide →
A biopsy is not a magical Morgellons test. The site and timing matter. A biopsy taken only from the center of a repeatedly opened ulcer may document trauma and repair while missing the process at the active edge. A removed plug or fiber loses its original tissue relationship. Clinicians decide the safest and most useful sampling method, but patients can help by preserving the least-altered finding.
No Side Has Earned a Visual Shortcut
The psychiatric interpretation becomes unreliable when every lesion is assumed to be self-created before primary disease is excluded. An infectious interpretation becomes unreliable when every unusual border, plug, scar, or fiber is treated as evidence of one pathogen. The four-patient 2013 paper said the association it reported “refutes claims that MD lesions are self-inflicted and that people suffering from this disorder are delusional.”[11] A selected series of four patients cannot support that categorical conclusion. It is the infectious side’s version of reasoning beyond what the observations establish.
A 2025 systematic review found no standardized Morgellons diagnostic criteria, no validated biomarker framework, and no randomized controlled treatment trials.[12] In that setting, “I know it when I see it” is not an adequate diagnostic standard—whether the speaker is a dermatologist, an infectious-disease clinician, a patient advocate, or a laboratory researcher.
The responsible conclusion: Morgellons should not be reduced to crawling sensations, but neither can a characteristic-looking lesion settle its cause. The skin deserves to be examined as evidence, with attention to morphology, chronology, tissue relationship, and competing explanations.
The Skin Is Evidence, Not a Verdict
The visible pattern matters. It may alert a clinician to chronic excoriation, delayed healing, infection risk, pigmentary change, follicular disease, or a perforating process. It may also show why a patient feels dismissed: the endpoint is obvious, while the beginning has gone undocumented.
Re-centering the lesion does not require denying sensation or defending every proposed cause. It requires a more basic medical habit: look carefully, preserve chronology, describe what is actually present, and separate the observation from the explanation.
A doctor may recognize damaged skin from across the room. The diagnosis still has to be made up close.
Sources
- Pearson ML, Selby JV, Katz KA, et al. Clinical, epidemiologic, histopathologic and molecular features of an unexplained dermopathy. PLOS ONE. 2012;7(1):e29908. doi:10.1371/journal.pone.0029908.
- Browne T. A Letter to a Friend. Written in the seventeenth century; published posthumously in 1690. See the passage describing “the morgellons.”
- Torales J, Ruiz Díaz N, Barrios I, et al. Psychodermatology of skin picking (excoriation disorder): a comprehensive review. Dermatologic Therapy. 2020;33:e13661. doi:10.1111/dth.13661.
- Cyr PR, Dreher GK. Neurotic excoriations. American Family Physician. 2001;64(12):1981–1984.
- Anetakis Poulos G, Alghothani L, Bendo S, Zirwas MJ. Neurotic excoriations: a diagnosis of exclusion. Journal of Clinical and Aesthetic Dermatology. 2012;5(2):63–64.
- Reynolds TB. The “butterfly” sign in patients with chronic jaundice and pruritus. Annals of Internal Medicine. 1973;78(4):545–546. doi:10.7326/0003-4819-78-4-545.
- Verma SB. Revisiting the origin, evolution and morphological nuances of the “butterfly sign”. Indian Dermatology Online Journal. 2021;12(3):475–476. doi:10.4103/idoj.IDOJ_552_20.
- Middelveen MJ, Fesler MC, Stricker RB. History of Morgellons disease: from delusion to definition. Clinical, Cosmetic and Investigational Dermatology. 2018;11:71–90. doi:10.2147/CCID.S152343.
- Harvey WT, Bransfield RC, Mercer DE, Wright AJ, Ricchi RM, Leitao MM. Morgellons disease, illuminating an undefined illness: a case series. Journal of Medical Case Reports. 2009;3:8243. doi:10.4076/1752-1947-3-8243.
- Savely VR, Stricker RB. Morgellons disease: analysis of a population with clinically confirmed microscopic subcutaneous fibers of unknown etiology. Clinical, Cosmetic and Investigational Dermatology. 2010;3:67–78. doi:10.2147/CCID.S9520.
- Middelveen MJ, Burugu D, Poruri A, et al. Association of spirochetal infection with Morgellons disease. F1000Research. 2013;2:25. doi:10.12688/f1000research.2-25.v1.
- Akbarialiabad H, Salehi S, Murrell DF, Jafferany M. Morgellons disease: a review on current evidence and the need for consensus, standardized criteria, and future randomized controlled trials. Archives of Dermatological Research. 2025;317:815. doi:10.1007/s00403-025-04308-6.
- Grant JE, Chamberlain SR. Trichotillomania and skin-picking disorder: an update. Focus (Am Psychiatr Publ). 2021;19(4):405–412. doi:10.1176/appi.focus.20210013.
- Freudenmann RW, Lepping P. Delusional infestation. Clinical Microbiology Reviews. 2009;22(4):690–732. doi:10.1128/CMR.00018-09.
