The Scalp Lichen Planus That Threatens Hair

What is lichen planopilaris?

Lichen planopilaris (LPP) is a scarring, or cicatricial, form of hair loss caused by the immune system attacking the stem cells that live at the top of the hair follicle. It is considered a variant of lichen planus, an inflammatory condition that can also affect the skin, nails, and mouth, though many people with LPP never develop lesions anywhere else. When it does turn up elsewhere, lichen planus in the nails, lichen planus inside the mouth, and lichen planus in the genital skin are the other sites it favors. It most often affects women in midlife, though it can occur in men and at other ages.

What makes LPP different from far more common causes of hair loss is where the damage lands. Ordinary thinning leaves the follicle intact and capable of regrowing hair once whatever caused the thinning resolves. LPP destroys the follicle's stem cells directly, and once that happens the follicle cannot make hair again — the visible sign is a patch of scalp that looks smooth, shiny, and devoid of the tiny follicle openings a healthy scalp has under close inspection.

Because the destruction is permanent, the entire aim of treating lichen planopilaris is to stop it from spreading to new scalp, not to regrow what is already lost.

How is it different from pattern hair loss?

Androgenetic (pattern) hair loss and lichen planopilaris can both start with thinning at the crown, which is why the two get confused early on, but they work through entirely different mechanisms. Pattern hair loss is driven by a hormone-sensitive miniaturization of the follicle over years — the follicle survives, just produces progressively finer hair — while LPP is an active immune attack that destroys the follicle outright, usually faster and with visible inflammation.

The scalp itself tells the two apart. A pattern-hair-loss scalp looks normal: no redness, no scale, no symptoms, just gradually finer and sparser hair. LPP typically shows redness and scale specifically around the still-active follicles at the edge of a patch, along with itching, burning, or tenderness that pattern hair loss essentially never causes. Pattern hair loss also responds to minoxidil and finasteride, which work by prolonging the follicle's growth phase and blocking the hormone driving miniaturization — treatments shown to slow or partly reverse androgenetic alopecia in both men and women 1Ref 1Adil A, Godwin M (2017).The effectiveness of treatments for androgenetic alopecia: A systematic review and meta-analysis.That minoxidil and finasteride are effective treatments for androgenetic (pattern) alopecia — used here to contrast with lichen planopilaris, which does not respond to these hormonally-targeted treatments.. Those same drugs do very little for LPP, because they aim at a follicle that is shrinking, not one being actively destroyed by inflammation.

How is it different from alopecia areata?

Alopecia areata is the other common source of confusion, since it also causes patchy hair loss and is also autoimmune. The National Institute of Arthritis and Musculoskeletal and Skin Diseases describes alopecia areata as a disease in which the immune system attacks hair follicles, typically producing round, smooth, hairless patches with an unpredictable course of loss and regrowth 2Ref 2National Institute of Arthritis and Musculoskeletal and Skin Diseases (2024).Alopecia Areata.That alopecia areata is an autoimmune disease in which the immune system attacks hair follicles, typically causing patchy hair loss with an unpredictable course, and that it is a distinct, non-scarring condition from lichen planopilaris.. The crucial difference is that alopecia areata does not scar the follicle — it can sit dormant and often regrows, sometimes on its own.

LPP patches, by contrast, are not smooth; they typically show the redness, scale, and loss of visible follicle openings described above, and hair loss does not reverse in the areas already scarred. Treatment options also diverge in a way that reflects this: alopecia areata now has a systemic option, baricitinib, an oral immune-modulating drug that showed clear hair regrowth over placebo in large phase 3 trials and became the first drug of its kind approved for the condition 3Ref 3King B, Ohyama M, Kwon O, et al. (2022).Two Phase 3 Trials of Baricitinib for Alopecia Areata.That baricitinib was shown superior to placebo for hair regrowth in phase 3 trials and became the first systemic FDA-approved treatment for alopecia areata — used to contrast with the absence of an equivalent regrowth-focused approval for lichen planopilaris.. No equivalent regrowth-focused approval exists for LPP, because by the time it is diagnosed, some of what it has already damaged cannot be recovered — which is exactly why catching it early matters more than it does for alopecia areata.

What does early lichen planopilaris look like?

The earliest signs are often subtle enough to be dismissed as dandruff or dry scalp: mild itching, burning, or tenderness in a small area, sometimes with faint redness or scale around individual hairs rather than a fully bald patch yet. A magnified look at the scalp, which a dermatologist can do in the office, often shows a ring of scale wrapped around the base of hairs at the active edge — a pattern that is fairly distinctive once someone knows to look for it.

Seborrheic dermatitis is the look-alike most likely to delay a correct diagnosis, since it also causes scalp redness, scale, and itching. It is a far more common, non-scarring condition treated with antifungal or antifungal-keratolytic medicated shampoos and, for flares, low-potency topical steroids 4Ref 4Clark GW, Pope SM, Jaboori KA (2015).Diagnosis and Treatment of Seborrheic Dermatitis.That seborrheic dermatitis of the scalp is a common, non-scarring condition treated with medicated antifungal shampoos and low-potency topical steroids — used to distinguish it from the scarring pattern of lichen planopilaris.. The distinguishing features are that seborrheic dermatitis scale is diffuse and greasy rather than wrapped tightly around individual follicles, it does not destroy the follicle, and it does not leave smooth, hairless patches behind.

A scalp biopsy is often what actually settles the diagnosis, because LPP's pattern under the microscope — inflammation targeting the follicle's stem-cell zone — is specific enough to distinguish it from both seborrheic dermatitis and alopecia areata when the exam alone is ambiguous.

How is lichen planopilaris treated?

Treatment is aimed at calming the immune attack before it reaches more follicles, and it typically starts at the scalp itself: the same first-line steroids for lichen planus used elsewhere on the skin, applied topically or injected into the active, inflamed edge of a patch, sometimes alongside a topical calcineurin inhibitor. This scalp-specific approach runs in parallel to cutaneous lichen planus treatment rather than following it exactly, since the priority on the scalp is speed — stopping new follicles from scarring — in a way that skin lichen planus, which does not scar, does not demand.

For disease that keeps spreading despite local treatment, clinicians reach for the same threshold that guides severe lichen planus treatment elsewhere on the body: when topical measures alone are not containing it, a systemic anti-inflammatory or immune-modulating medication is added, chosen based on how active the disease is and how it is tolerated — the specifics, and the dose of any of these, are a decision between a person and their prescriber, not something to self-manage from an article.

Because LPP tends to move in an unpredictable, patchy way — active for a period, then quiet, sometimes flaring again years later — treatment response is usually judged by whether new patches stop appearing and whether the itching, burning, and redness at existing edges settle, not by whether lost hair returns. A dermatologist who specializes in hair disorders typically re-examines the scalp at intervals to check whether the disease is still active at the margins.

Most people's disease can be brought to a quiet, non-progressive state with treatment, even though the areas already scarred stay that way.

What can be done once it's stable?

Once lichen planopilaris has been quiet for a sustained stretch — typically judged in years, not months, since a flare after apparent quiet is common — some people consider ways to address the visible bald patches themselves, separate from treating the underlying disease. Camouflage options like scalp micropigmentation or styling to cover a patch carry no risk of reactivating the disease. Hair transplantation into LPP-affected scalp is far less predictable than transplantation for pattern hair loss, because transplanted follicles can be attacked by the same disease process if it reactivates, so most specialists want to see a long, confirmed period of inactivity before considering it, and some will not recommend it at all.

The reasonable expectation to hold onto is that a scarred patch stays a scarred patch; the win with treatment is a scalp that stops losing more ground, not one that regrows what is gone.

When to see a dermatologist

Any hair loss that comes with redness, scale confined around individual hairs, itching, or burning — rather than plain thinning — is worth having examined promptly rather than waited out, because LPP is one of the few hair-loss causes where waiting has a real, permanent cost. A dermatologist experienced with scarring alopecias can often recognize the pattern on a magnified scalp exam and confirm it with a small biopsy if needed.

Lichen planopilaris is rare, and most hair loss — even patchy or sudden hair loss — is something else, usually pattern hair loss or alopecia areata, both of which carry a better outlook for regrowth. Getting an accurate diagnosis early is what protects the hair that has not been affected yet.