Lichen planopilaris (LPP) is a type of scarring hair loss caused by the immune system attacking hair follicles on the scalp. It belongs to a group of conditions called primary cicatricial alopecias, where inflammation permanently destroys the follicle and replaces it with scar tissue. Because the damage targets the stem cells that regenerate hair, the hair loss in affected areas is irreversible. Treatment focuses on stopping the inflammation before more follicles are lost.
What Happens Inside the Hair Follicle
Every hair follicle has a region called the bulge that houses stem cells responsible for regenerating the hair through its growth cycles. Normally, this area is immunologically “hidden” from the body’s immune system, a protective status known as immune privilege. In LPP, that protection breaks down. The follicle starts displaying surface markers that flag it as a target, and the immune system responds as though the follicle is a threat.
What follows is a focused attack by immune cells. Cytotoxic T cells and specialized inflammatory cells cluster around the upper portion of the follicle, releasing signals that drive a cycle of inflammation. A protein called interferon-gamma appears to be a key trigger: in lab experiments, exposing unaffected skin from LPP patients to interferon-gamma was enough to collapse the follicle’s immune protection. The resulting inflammation destroys the stem cell region, and without those stem cells, the follicle cannot produce new hair. Over time, the body fills in the space with fibrous scar tissue, and the follicle is permanently gone.
Three Clinical Subtypes
LPP presents in three recognized forms, each with a distinct pattern of hair loss.
- Classic LPP causes irregular patches of hair loss, most commonly at the top of the scalp. The patches can be single or multifocal and don’t follow a predictable band-like pattern.
- Frontal fibrosing alopecia (FFA) is a slowly progressive recession of the hairline at the front and sides of the scalp. It frequently involves the eyebrows as well, and some people develop facial papules, body hair loss, or skin discoloration on the face and neck. FFA has become increasingly common, particularly in postmenopausal women.
- Graham-Little-Piccardi-Lassueur syndrome is the rarest form, combining scarring hair loss on the scalp with non-scarring hair loss in the armpits and pubic area, plus small, rough follicular bumps on the trunk and limbs.
What It Looks and Feels Like
The hallmark of active LPP is redness and scaling at the base of individual hairs, especially around the edges of a bald patch. You might notice tiny, tube-shaped scales that wrap around the hair shaft and climb slightly away from the scalp. These perifollicular casts are one of the more distinctive visual clues.
Symptoms vary. Some people experience burning, itching, tenderness, or a prickling sensation in areas of active disease. Others notice hair thinning or shedding before any discomfort starts. As the disease progresses, the affected skin becomes smooth, pale, and shiny, with no visible follicular openings. At that point, the inflammation has burned out and the scarring is complete.
How LPP Is Diagnosed
Diagnosis typically involves a combination of a clinical exam, a close-up scalp examination using a dermatoscope, and a small skin biopsy.
Trichoscopy
Under magnification, a dermatologist looks for specific patterns. The absence of follicular openings appears in over half of LPP cases. Perifollicular tubular casts, those characteristic tube-shaped scales, are seen in roughly one in five cases and are considered highly suggestive of LPP. A “target pattern” of blue-gray dots arranged in circles around follicles shows up in about a quarter of cases. White dots, both pinpoint and fibrotic, are also significantly more common in LPP than in other scarring alopecias.
Scalp Biopsy
A small punch biopsy remains the gold standard for confirming the diagnosis. Under a microscope, the key findings include a band of immune cells clustered around the upper hair follicle, thickening of the outer layer of the follicle, loss of the oil glands that normally sit beside each hair, and destruction of the follicle’s outer sheath. In later stages, the inflammation fades and is replaced by rings of scar tissue encircling what used to be the follicle. Eventually, all that remains are fibrous tracts where follicles once stood.
Distinguishing LPP From Similar Conditions
Several other conditions cause scarring hair loss, and they can look similar at first glance. The most common source of confusion is discoid lupus erythematosus (DLE), another inflammatory scarring alopecia. A few features help tell them apart.
In LPP, the inflammation and scarring stay tightly focused around the hair follicle, sparing the skin between follicles. DLE involves the interfollicular skin as well, causing broader patches of scarring and discoloration. Under trichoscopy, LPP shows tube-shaped perifollicular scaling, while DLE produces thick keratin plugs within the follicle openings. The blue-gray dots seen in LPP form a circular “target” pattern around follicles, whereas in DLE they appear scattered or speckled across the skin between follicles. White areas of fibrosis between follicles are characteristic of DLE but not LPP.
A biopsy can usually settle the question. Early LPP shows thickening at the follicle’s outer layer with a dense band of immune cells confined to the follicular area. Early DLE, by contrast, shows thinning of the outer skin layer, keratin plugging, and clear involvement of the skin between follicles.
Treatment Options
There is no cure for LPP. The goal of treatment is to reduce inflammation, relieve symptoms, and prevent further hair loss. What has already scarred will not regrow, so early and consistent treatment matters.
First-Line Therapies
Most dermatologists start with potent topical anti-inflammatory creams or ointments applied directly to active areas. These can be combined with a topical immune-modulating ointment. For people with more widespread or stubborn disease, an oral anti-inflammatory medication originally developed for malaria is generally considered the first-line systemic option. It works by dampening the overactive immune response, and patients typically take it for months while their dermatologist monitors for side effects, particularly to the eyes.
Steroid injections directly into the scalp at sites of active inflammation are another common approach, often used alongside topical or oral treatments. These can calm a flare relatively quickly but need to be repeated periodically.
When Standard Treatments Don’t Work
For cases that don’t respond to first-line options, a newer class of medications called JAK inhibitors has shown promise. These drugs block specific immune signaling pathways involved in the follicle attack. In one retrospective study, 80% of patients treated with a JAK inhibitor showed improvement, with a significant reduction in disease activity scores. Another study using a different JAK inhibitor found an initial reduction in disease activity of about 47% in LPP patients, though sustained improvement at six months was seen in only three of seven patients. Some patients who fail one JAK inhibitor don’t respond to others in the same class either, suggesting this approach works well for some people but not all.
Monitoring Disease Activity
Dermatologists track LPP using a scoring system called the Lichen Planopilaris Activity Index (LPPAI). It assigns numeric values to symptoms like itching and burning, clinical signs like redness and scaling, and whether the area of hair loss is actively spreading. The score is recalculated at follow-up visits to gauge whether treatment is working. A declining LPPAI means the disease is quieting down. A stable or rising score signals that a change in treatment may be needed.
What to Expect Long Term
LPP is a chronic condition that tends to wax and wane. Some people experience a single episode that eventually burns out on its own after months or years of activity. Others have recurring flares over a longer period. The central reality of the disease is that any hair follicle destroyed by the inflammatory process is permanently lost, because the stem cells needed to regenerate that follicle have been replaced by scar tissue.
This is why the emphasis in treatment is always on speed and persistence: stopping inflammation before it reaches more follicles. People who are diagnosed early and respond well to treatment can preserve most of their hair. Those diagnosed later, after significant scarring has occurred, may benefit from cosmetic options like hair toppers, specialized styling, or, in select cases, hair transplantation into stable, non-inflamed areas. The transplant option is only considered once the disease has been inactive for a sustained period, since transplanting into actively inflamed skin would likely result in loss of the grafted follicles as well.