What Is the Difference Between LPP, FFA, and GLPLS?

Classic lichen planopilaris (LPP), frontal fibrosing alopecia (FFA), and Graham-Little-Piccardi-Lassueur syndrome (GLPLS) are generally grouped together by dermatologists as part of the same “lichenoid spectrum” ^[1][2]. Rather than being completely separate diseases with different causes, they are considered different clinical patterns of a similar underlying inflammatory process ^[1][3]. The exact biological cause is not completely established, but all three involve an inflammatory response that targets hair follicles.

To understand these patterns, it is crucial to know the difference between scarring and non-scarring hair loss:

• Scarring (cicatricial) hair loss: Inflammation permanently destroys the hair follicle and replaces it with scar tissue. Hair generally cannot regrow in these areas ^[1].
• Non-scarring hair loss: The hair falls out, but the follicle remains intact beneath the skin, meaning regrowth is possible once the underlying trigger is managed ^[4].

Comparing the Three Clinical Patterns

Classic Lichen Planopilaris

In the classic form, scarring hair loss typically appears as distinct, scattered patches across the scalp ^[1]. These patches frequently develop on the vertex (the top or crown of the head) ^[5][6]. At the edges of these patches, there is usually visible redness and perifollicular casts—sleeve-like scale and debris wrapped around the base of the hair shafts ^[7][8].

Frontal Fibrosing Alopecia (FFA)

FFA is most often characterized by a progressive, band-like recession of the frontal and temporal hairline (near the forehead and temples), though other, atypical patterns can occur ^[9][1]. Another hallmark is the loss of eyebrows, which is very common but not universal ^[10][11]. Some people with FFA may also develop small bumps on their face or lose body hair ^[12][13].

Graham-Little-Piccardi-Lassueur Syndrome (GLPLS)

This rare subtype is defined by a specific trio of symptoms ^[4][3]:

1. Patchy, scarring hair loss on the scalp (similar to classic LPP) ^[4].
2. Non-scarring hair loss in the armpits (axillae) and the groin or pubic region ^[4][3].
3. A bumpy, rough rash consisting of small, elevated bumps related to hair follicles (follicular spinous papules) on the trunk or limbs ^[4][3].

How Patterns Overlap and Evolve

While these categories help describe your symptoms, they are not rigid boxes. People with FFA can lose body hair, and eyebrow loss sometimes occurs in classic LPP ^[13][14]. Because these patterns overlap, your specific diagnosis provides useful clues but cannot, by itself, predict how rapidly your individual condition will progress or how you will respond to treatment ^[1].

How Your Doctor Makes a Diagnosis

Because these conditions are part of the same spectrum, their microscopic features are often too similar to confidently tell apart in a lab ^[15]. A dermatologist will look at the whole picture:

• Clinical Examination: Checking your scalp, hairline, eyebrows, and body hair for specific patterns ^[15][16].
• Trichoscopy: A dermoscopic examination using a specialized handheld magnifier to look at the skin closely. Active inflammation often shows scaling and redness around the hairs ^[7]. Areas with established scarring often look shiny and white, indicating a loss of hair follicles ^[17]. Note that a shiny area does not guarantee the disease is permanently “safe” or inactive, as active inflammation can still exist nearby at the margins.
• Scalp Biopsy: A small skin sample taken using a local anesthetic (which leaves a small scar). A biopsy is not always required, but it is used to confirm scarring inflammation when a diagnosis is uncertain ^[18][16]. If needed, the doctor will take the sample from an “active edge” (an area with active inflammation) rather than an old scarred center, to get the most accurate result ^[16].

Treatment Goals and Monitoring

The primary goal of treating any LPP variant is to quiet the active inflammation, halt progression, and preserve the hair you still have ^[1]. Because follicles destroyed by scarring cannot regrow hair, timely assessment by a dermatologist is important if you notice expanding hair loss, new redness, scaling, or changes to your eyebrows and body hair. Between visits, taking consistent photographs in good lighting can help you and your doctor track subtle changes.