BIOPSY · SAMPLING · EVIDENCE
A pathology report can accurately describe the tissue on the slide while leaving the question that prompted the biopsy unanswered. The distinction depends on the lesion chosen, what survived processing, and what the pathologist was asked to examine.
The key question: did the specimen capture the finding that prompted the biopsy?
Written and researched by Jeremy Murphree, Morgellons patient advocate and founder of MorgellonsSurvey.org. Jeremy is not a physician.
Last updated: October 5, 2026
You noticed a persistent skin finding, perhaps a plug, a filament, or a sore that keeps reopening. A clinician took a biopsy. Then the report came back with words such as nonspecific inflammation, excoriation, or no significant abnormality. It can feel as though the report says that nothing happened—or that what you saw was dismissed.
The report deserves a more precise reading. A skin biopsy examines a particular piece of tissue, from a particular site, at a particular stage. It may identify a cause, narrow the possibilities, document an injury or infection, or show no diagnostic change in the sections examined. It does not automatically reconstruct everything that happened at that spot before the sample was taken.
That limit cuts both ways. A nondiagnostic biopsy does not prove that an unusual structure was present outside the sections. It also does not prove that the patient never had a physical finding. The practical question is whether the biopsy captured the feature everyone was trying to explain.
What the report actually examined
Before interpreting the final diagnosis line, ask what was sampled. Was the biopsy taken from the active lesion or from nearby skin? Was a plug or filament visible in place before the procedure? Did the specimen include that target and the tissue beneath it? Had the area already been scratched, opened, treated, or partially healed?
These details are part of the evidence, not an objection to pathology. A pathologist can describe an excoriated ulcer accurately even when the original papule or plug is no longer available. Conversely, a carefully targeted biopsy may reveal folliculitis, an inflammatory disorder, foreign material, infection, or a recognized perforating process that needs attention regardless of the label a patient used before the visit.
It also matters what the pathologist was told. The requisition that travels with a specimen usually carries a brief clinical history and the question the clinician wants answered. A pathologist looking at a slide labeled only “rule out dermatitis” is not being asked the same question as one told that a filament was seen protruding from the lesion before biopsy. Reasonable questions to raise with the clinician include:
- Did the requisition describe the visible target and include the clinical question or photographs?
- Was the biopsy a punch, which samples deeper dermis, or a shave, which may not include tissue beneath the target?
- If foreign material was part of the question, was the slide examined under polarized light?
- Was any material that separated from the lesion submitted to the laboratory in its own labeled container, and was it examined?
These are questions to ask, not procedures a patient can direct. The answers help explain what a report could and could not have addressed.
In the CDC-led investigation of an unexplained dermopathy often called Morgellons, 37 of the biopsies were taken from lesions. Their findings varied. Fifteen showed changes compatible with excoriation or chronic irritation; 19 showed solar elastosis, and six had features compatible with an arthropod bite or drug reaction. These are counts of lesions, not percentages of everyone in the study, and the categories can overlap.[1]
The study detected birefringent material in 16 of the 37 biopsied lesions. Most material detected in the biopsy specimens had spectral characteristics of cellulose compatible with cotton fibers. In all but two specimens, the birefringent material was located in the superficial scale-crust, at the edge of or separate from the tissue, or on the biopsy surface, and it did not provoke a tissue reaction.[1]
Separately, 23 samples of fibers or other material were collected from intact skin sites in 12 participants. Those samples were predominantly protein (83%), interpreted as likely superficial skin; cellulose consistent with cotton was found in 43%. The categories overlapped. These separately collected samples should not be conflated with the biopsy findings.[1] The study did not identify one common cause across its evaluated group.
The varied results are a reason to take an individual report seriously. “Morgellons biopsy” is not one specimen type, and no single pattern has been independently validated to diagnose every presentation described by that name.
CDC-led study · counts of biopsied lesions, not unique people
Categories overlap. Do not add the bars to calculate a total. These findings do not establish the cause of every reported symptom. Source 1
Open the material-location findings behind the CDC summary
Birefringent material was found in 16 of 37 biopsied lesions. Except in two specimens, it was superficial, at the tissue edge, separate from the tissue, or on the biopsy surface without a tissue reaction.[1]
The two exceptions contained foreign-body-type giant cells. One contained cellulose consistent with cotton fragments; the other contained silicon-bearing material considered likely to be silicates. Both had features suggesting earlier ulceration or trauma.[1]
The separately collected intact-skin samples are a different dataset: 23 samples from 12 participants, with protein in 83% and cellulose in 43%. Those categories overlapped.[1]
Reading common pathology language without stretching it
Explore the wording on your report
Open a phrase below for a focused question to discuss with your clinician. This guide explains the scope of a finding; it does not interpret your individual report.
The report says “normal” or “nonspecific”
Ask: Was the intended target present in the sections, and what did the examined tissue make less likely?
A nondiagnostic section cannot establish that a finding never existed. It also cannot establish that an unseen structure was present.
The report says “excoriation” or “chronic irritation”
Ask: Can the examination and dated photographs help establish what was present before the site was opened or manipulated?
The slide may document injury and repair without establishing what came first.
The report mentions foreign or birefringent material
Ask: Where was the material, did the tissue react to it, and was its composition investigated?
Material at a biopsy edge, on its surface, or in a crust carries a different evidentiary meaning from material embedded in tissue with a reaction.
A stain or culture is negative
Ask: What target did the test examine, in which specimen, and by which method?
A negative test describes the material and target tested. Its broader meaning depends on the sample and the method.
Pathology phrases are best read alongside the examination, photographs, and the clinician’s question. The examples below explain the ordinary scope of a finding; they cannot interpret an individual report without its full context.
| Report language you may encounter | What it can establish | What it cannot establish by itself |
|---|---|---|
| No significant histopathologic abnormality | The examined sections did not show a diagnostic abnormality. | That a small or earlier finding never existed elsewhere or at another stage. |
| Superficial perivascular inflammation | Inflammatory cells were seen around superficial vessels. | One specific cause of the inflammation without supporting clinical or laboratory findings. |
| Excoriation, erosion, or chronic irritation | The sampled skin shows injury and repair. | What was present or felt at that site before the injury occurred. |
| Solar elastosis | Sun-related change is present in the sampled skin. | The origin of a reported plug, filament, or skin sensation. |
| Foreign or birefringent material | Material was visible in the specimen; its location and tissue reaction may help interpret it. | That every similar-looking object on the body has the same source. |
| Negative stain or culture | The specified target was not detected by that method in the material tested. | That no relevant process exists anywhere else in the skin or body. |
These are not codes for “real” versus “imagined.” They are observations with different levels of specificity. A report that identifies a concrete, treatable condition should guide the next clinical discussion. A report that is descriptive rather than diagnostic calls for correlation with what the clinician saw and what was actually submitted.
The case in which the target disappeared
A 2017 Korean case report illustrates the problem unusually well. A 30-year-old woman presented with two months of itchy red patches and erosions on her arms, hands, and chin. She had been treated for narcolepsy for 12 years with modafinil, a stimulant, and venlafaxine. Her own magnified photographs showed what she described as twisted black, brown, and red fibers in her skin.[2]
During gross examination of the biopsy specimen, a single black fiber was seen extruding from its dermal side. After routine processing, no corresponding fiber appeared in the sections. The remaining tissue showed mild superficial perivascular lymphocytic inflammation. Periodic acid–Schiff, Grocott methenamine silver, Warthin–Starry, and Wright–Giemsa stains were negative, as were tissue culture and serology for Borrelia burgdorferi. Masson’s trichrome stained ordinary dermal collagen.[2]
The authors concluded that the presentation represented delusional infestation rather than a somatic disease. They advised psychiatric evaluation and antipsychotic medication; the patient declined follow-up.[2]
The authors also proposed that the fiber “could be dissolved by the organic solvents used in the tissue preparation process,” but they did not demonstrate that this happened. The responsible conclusion is narrower: the object was seen before processing and was not available for characterization in the resulting sections. The negative findings describe the tissue that remained. They cannot identify the vanished object’s composition or its full relationship to the skin.
One cautious inference follows from the solvent hypothesis, if it were correct. Keratin and collagen ordinarily survive routine formalin, alcohol, and xylene processing; they are present on virtually every skin slide. A fiber that truly dissolved during processing would therefore be an unlikely candidate for either material. Because dissolution was never shown, this remains a conditional point, not a finding.
The case cuts in more than one direction. The treating team reached a psychiatric conclusion, yet documented a fiber that its final slides could not account for. This is one case, not evidence that every nondiagnostic biopsy loses a crucial finding. It shows why a visible target and its location should be documented before a specimen is disturbed, and why a final slide cannot answer a question about a structure that is absent from it.
Why site, stage, and section depth matter
A biopsy is a series of thin sections through a three-dimensional lesion. A small focal structure may not appear in the initial planes examined. The lesion itself may also change over time: an intact papule, an open sore, and a healing scar can display different features.
Evidence from acquired perforating dermatosis, a separate group of recognized skin disorders, illustrates the sampling issue. In a 37-patient clinicopathologic study, the first sections of nine cases showed an epidermal indentation and thickening but did not show the material passing through the skin. Additional serial sections identified the passage in six; three were diagnosed after a biopsy of another lesion.[3] That study did not establish a perforating diagnosis in Morgellons patients. It demonstrates how the answer to a specific architectural question can depend on the lesion and the sections available.
A nine-case subgroup within Gao’s 37-patient acquired perforating dermatosis study
The first sections in these nine cases did not demonstrate material passing through the epidermis.
Serial sections demonstrated fiber elimination.
A biopsy of another lesion established the diagnosis.
This was an APD cohort, not a Morgellons cohort. The chart illustrates sampling limits; it cannot estimate how often additional sections would help a Morgellons patient. Source 3
More sections are not automatically the answer to every inconclusive report. If the suspected feature was removed before biopsy, was never inside the sampled tissue, or is no longer present in the stored block, deeper cuts cannot recreate it. A dermatologist and dermatopathologist can decide whether reviewing existing slides, examining the original block, or sampling a different active lesion would answer a question that matters for care.
Watch: how a biopsy becomes a pathology slide
Watch directly on YouTube · University of Michigan’s video resource
What if the report says the lesion was caused by picking?
Repeated scratching, squeezing, or extraction can produce substantial and visible injury. It can enlarge a sore, introduce environmental fibers, and obscure an earlier feature. The CDC-led study’s findings of chronic irritation and of mostly superficial, cotton-like material should not be waved away.[1]
But a biopsy of an already altered site is a snapshot after those events. It may establish that manipulation occurred without establishing whether a papule, follicular plug, other skin disorder, or abnormal sensation came first. The reverse inference is also unsupported: finding a plug later does not prove that it caused a sensation or prompted the patient to touch the site. Both sequences need observation before the tissue is disturbed.
That is why the most useful conversation concerns chronology and anatomy, not a contest over whether the patient or the report must be wholly right. A small number of dated, unedited photographs and a brief account of what happened before the area was opened can help a clinician relate the clinical history to the slide. The clinical visit pack provides a way to organize those details without turning a photograph into a diagnosis.
Three questions to take back to the clinician
Was the intended target present in the sections? If the biopsy was meant to evaluate a particular plug or filament, ask whether the pathology report actually describes it. A report about neighboring inflammation may still be useful, but it addresses a different question.
What did this result support or make less likely? “Nonspecific” does not mean “useless.” The clinician may have ruled out a suspected infection, tumor, infestation, or inflammatory pattern in the tested tissue. The strength of each conclusion depends on the sample and the methods used.
Would another step change care? Depending on the lesion and the clinical findings, this might mean reviewing the existing slides with the dermatologist’s photographs and question, treating a condition the biopsy did reveal, or considering a new sample from an appropriate active site. Repeated biopsies without a clear question have costs and can create additional wounds. The decision belongs with the treating team.
If a plug-centered lesion raises the possibility of a perforating disorder, the question is more specific than “Are there fibers?” A pathologist would need to assess whether altered material travels through an organized epidermal or follicular channel while its relationship to deeper tissue is preserved. Collagen and elastic stains can help classify material in that intact architecture; a stain alone is not a Morgellons test. Our RPC comparison explains why that research question remains open.
A result can be limited and still matter
A normal or nonspecific result is not a verdict on a person’s honesty or the severity of symptoms. It is a statement about what the submitted tissue showed under the methods used. Sometimes that statement is enough to guide treatment or exclude a particular concern. Sometimes the finding that prompted the biopsy was not captured, and the original question remains unanswered.
The useful next step is to put the report back beside the lesion, its timing, and the clinician’s examination. Ask what was actually present in the sections, what the result changes, and whether any further evaluation would be likely to improve care. The goal is a more accurate explanation of the skin finding—and timely attention to pain, infection, and wound healing while the larger debate remains unresolved.
For a broader review of published tissue studies, see what Morgellons histology shows and does not show. For the limits of blood tests, home tests, fiber analysis, and biopsy, see Is There a Morgellons Test?.
This article is educational and cannot interpret an individual pathology report or recommend a biopsy. Seek prompt medical evaluation for a lesion with spreading redness, warmth, increasing pain, swelling, pus, fever, or rapid worsening.
Primary sources
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. doi:10.1371/journal.pone.0029908.
2. Ohn J, Park SY, Moon J, Choe YS, Kim KH. Morgellons disease. Ann Dermatol. 2017;29(2):223–225. doi:10.5021/ad.2017.29.2.223.
3. Gao Z, Lu S-J, Shan S-J. Acquired perforating dermatosis: A clinicopathologic study, and the features of dermoscopy and reflective confocal microscopy of 37 cases. Skin Res Technol. 2023;29(7):e13416. doi:10.1111/srt.13416. Comparison population; not a Morgellons cohort.
Prepare for the follow-up visit
Bring the complete pathology report, a short symptom timeline, and a few dated photographs. Use the clinical visit pack to organize the clinical question and the evidence you want the clinician to review.
Open the Clinical Visit Pack · Review Morgellons testing limits