Don’t Overlook Lichen Planopilaris — How to Distinguish ‘Inflammation-Driven Follicle Loss’ from AGA, and the Boundaries of Stem Cell Conditioned Media2026.07.09

“I’ve been on AGA treatment, but a specific area still refuses to grow back.” “My scalp itches or feels prickly.” — Behind these complaints, a condition called lichen planopilaris (LPP, also written as follicular lichen planus) can be hiding. Unlike AGA, in which stem cell conditioned media and pharmacotherapy can potentially improve the follicular environment, lichen planopilaris is a scarring alopecia that destroys the follicle itself. Left untreated, follicles are lost irreversibly — a fundamentally different disease process. In this article, Dr. Moriwaki organizes how to distinguish it from AGA and the true boundaries of stem cell conditioned media.

Key Points of This Article

・Lichen planopilaris is a scarring alopecia where the follicle itself is destroyed by inflammation, mechanistically distinct from (non-scarring) AGA

・Itching, tingling, loss of follicular ostia, scalp shine, and sharply demarcated bald patches are warning signs

・In scarred areas the follicles are lost, so stem cell conditioned media alone cannot produce regrowth

・Diagnosis is based on dermoscopy and biopsy by a dermatologist; anti-inflammatory therapy takes first priority

・Once inflammation has quieted, stem cell conditioned media may be considered cautiously to preserve the environment of any surviving follicles

What Is Lichen Planopilaris — How Does It Differ from AGA?

Lichen planopilaris (LPP) is an autoimmune inflammatory disorder in which lichen planus, a skin disease, occurs around scalp hair follicles. The main target is the upper follicle — specifically the “bulge” region, which houses follicular stem cells. Once the bulge is destroyed, the entire follicle undergoes fibrosis and is replaced by scar tissue. This is decisively different from AGA, where follicles miniaturize but structurally persist.

In AGA, DHT acting via 5α-reductase shortens the anagen phase and miniaturizes the follicle. Because the follicles themselves are still there, oral medications, topical treatments, and stem cell conditioned media can potentially prolong anagen and re-thicken the shafts by improving the follicular microenvironment. In scarring alopecia, however, once follicles are destroyed regeneration is not realistic — the top priority becomes “not losing any more of what remains.” Proceeding with treatment without understanding this distinction risks silent progression of inflammatory follicle loss to an irreversible point.

Signs to Suspect It, and How to Tell It from AGA

The following features suggest peri-follicular inflammation rather than plain AGA:

・Persistent itching, tingling, or burning sensations on the scalp

・Sharply demarcated bald areas with a shiny, glossy scalp surface

・Regions where the follicular openings (ostia) themselves have disappeared

・Erythema around the bald patch and peri-follicular hyperkeratosis (white keratotic rings around the ostia)

・Receding hairline with concurrent thinning of eyebrows or body hair (suspicious of frontal fibrosing alopecia / FFA)

AGA typically lacks these inflammatory signs and subjective itching. If even one of these — persistent itch, glossy scalp, missing ostia — is present, do not push through with AGA-focused treatment alone; a dermatological differential diagnosis takes priority. In women in particular, a receding frontal hairline combined with eyebrow or body-hair loss strongly suggests the FFA subtype.

How Diagnosis Is Made — Dermoscopy and Biopsy

Diagnosis is based on a dermatologist’s history-taking and visual exam plus dermoscopy (magnified view) and, where needed, histopathology. Dermoscopy assesses peri-follicular erythema, hyperkeratosis, and loss of follicular ostia. In difficult cases, a few-millimeter punch biopsy of the scalp allows histological confirmation of the characteristic band-like lymphocytic infiltrate and follicular fibrosis.

Self-diagnosing “just thinning hair” and pursuing only cosmetic hair-growth treatments risks silent progression of inflammatory follicle destruction. Whenever non-AGA-like signs appear — itch, discomfort, scalp shine — dermatological workup should take priority. Guidelines from the Japanese Dermatological Association are a useful reference.

Does Stem Cell Conditioned Media Work for Lichen Planopilaris? — Drawing Honest Boundaries

This is the crucial point. Stem cell conditioned media contains growth factors, cytokines, and exosomes, and preclinical studies suggest it may help sustain the anagen phase by improving the peri-follicular microenvironment. However, when the follicles themselves are being destroyed by inflammation, we do not consider stem cell conditioned media a first-line choice, for the following reasons:

・Injecting into a scalp with active inflammation cannot be ruled out as a stimulus that may worsen inflammation

・In scarred zones where follicles are already lost, supplying growth factors cannot regenerate new follicles

・The primary treatment for lichen planopilaris is anti-inflammatory therapy (topical steroids, topical tacrolimus, oral hydroxychloroquine, etc.), which must come first

Accordingly, when scarring alopecia is suspected, the first step is to confirm the diagnosis with a dermatologist and control the inflammation. Stem cell conditioned media may be considered cautiously — only after inflammation has stabilized — as a way to preserve the microenvironment of surviving follicles or to address coexisting AGA / female pattern hair loss, in coordination between dermatology and regenerative hair medicine. Related columns are available in our hair regenerative medicine column list.

Clinical Decision Flow — Centered on “Presence or Absence of Inflammation”

At our clinic, we assess hair-loss consultations in this order:

1. History: itching, discomfort, speed of progression, past skin disease

2. Microscope / dermoscopy: state of follicular ostia, hair-shaft caliber variation, peri-follicular erythema

3. If signs suggest scarring alopecia: prioritize dermatology referral, biopsy, and specialist assessment

4. If pure AGA or female pattern hair loss: design a treatment plan combining oral / topical medications and stem cell conditioned media

5. Once inflammatory scarring alopecia is quiescent, stem cell conditioned media may be considered cautiously as adjunctive care to preserve the environment of surviving follicles

By not defaulting to “thinning hair equals AGA” and keeping the possibility of scarring alopecia in mind from the first visit, we protect patients’ remaining follicles. Because responses vary between individuals and every treatment has limits, we consider it essential to present options honestly.

Frequently Asked Questions

Q. Can lichen planopilaris be treated with AGA drugs (finasteride, minoxidil)?

Because the cause is autoimmune inflammation, AGA drugs do not treat the underlying disease. The mainstay is anti-inflammatory treatment such as topical steroids, topical tacrolimus, and oral hydroxychloroquine. If AGA coexists, AGA drugs may be added, but controlling inflammation comes first in the sequence.

Q. Can stem cell conditioned media revive follicles that have already been lost?

There is currently no established treatment that regenerates follicles once they have fibrosed and disappeared. Stem cell conditioned media is meant to improve the environment of remaining follicles and does not guarantee regrowth in scarred areas. It is important to position it honestly with individual variability and limits in mind.

Q. My scalp itches — could it be scarring alopecia?

Itching has many causes besides scarring alopecia, including seborrheic dermatitis, contact dermatitis, and dryness. That said, when itch coexists with hair loss, a dermatologist should first differentiate scarring alopecia and inflammatory scalp disorders. It’s important not to ignore it based on self-judgment.

Q. Is a biopsy needed for diagnosis? Will it leave a scar?

A small (few-millimeter) scalp biopsy is often invaluable for definitive diagnosis. It is done under local anesthesia; the wound is small and, in most cases, well hidden under the surrounding hair. Because an incorrect diagnosis leads to a fundamentally different treatment plan, biopsy is often well worth doing when suspicion is high.

Q. Can AGA and lichen planopilaris coexist?

Coexistence is entirely possible. In middle-aged and older men, AGA can be progressing while patches of scarring inflammatory alopecia are added on top. The basic approach is to quiet the inflammation first, then address AGA by combining oral, topical, and stem cell conditioned media therapies.

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Supervising Physician: Shin Moriwaki, MD

Japan Society of Aesthetic Surgery (JSAS) Member / American Academy of Aesthetic Medicine Member

ECFMG Certificate (US Medical License Qualification)

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