Understanding Lichen Planopilaris: An Orientation

A diagnosis of Lichen Planopilaris (LPP) can feel overwhelming, especially because it is a condition many people—and even some doctors—have never heard of. You are likely here because you have noticed patches of hair loss, perhaps accompanied by itching or burning, and have been told that this is an “immune-mediated scarring alopecia.”

In plain language, this means your immune system is mistakenly targeting your hair follicles, leading to permanent hair loss in the affected areas. While this is a rare condition, understanding how it works is the first step in taking control of your care.

What This Means For You Now

• It is not contagious: You cannot pass it to anyone else.
• It is not caused by poor hygiene: How you wash your hair did not cause this.
• It is not your fault: LPP is an immune-mediated disease, not the result of something you did wrong.
• The course is variable: Some people experience a single episode that eventually stops, while others have a chronic, slowly progressing course.

Why the Hair Loss is Permanent

To understand LPP, it helps to think of the hair follicle as having a “command center” called the bulge. This area contains stem cells, which are responsible for regenerating the hair follicle and growing new hair ^[1].

In LPP, immune cells—specifically T cells and macrophages—gather around the upper follicle and target this command center ^[2][3]. This response causes two major problems:

1. Destruction of Stem Cells: The immune system may trigger a process called epithelial–mesenchymal transition (EMT), which research suggests alters the stem cells’ identity, making them unable to grow hair ^[4][1].
2. Scarring (Fibrosis): As the follicle is destroyed, the body replaces the delicate hair-producing structure with fibrosis, or scar tissue ^[5].

Once a follicle has been completely replaced by scar tissue, it can no longer produce a hair. This is why LPP is classified as a cicatricial (scarring) alopecia. Note that permanence applies to follicles that have actually been destroyed and scarred; partially injured follicles may sometimes recover when inflammation is controlled.

Three Ways LPP Can Appear

LPP is actually a “spectrum” of disease. Doctors generally recognize three main ways it shows up, though the underlying immune response is thought to be similar in all of them ^[6].

1. Classic Lichen Planopilaris

This is the most common form. It typically appears as patchy areas of hair loss, often starting at the top (vertex) of the head ^[7]. You might see redness (erythema) or small scales and “casts” wrapped around the base of individual hairs ^[8]. It often causes physical symptoms like itching or a burning sensation.

2. Frontal Fibrosing Alopecia (FFA)

FFA is considered a variant of LPP that follows a very specific pattern: a slow, uniform recession of the front and side hairline ^[9]. It is often accompanied by the thinning or complete loss of eyebrows ^[10]. While it most commonly affects postmenopausal women, it can occur in anyone.

3. Graham-Little-Piccardi-Lassueur Syndrome (GLPLS)

This is an extremely rare variant. It is defined by a “triad” of three specific symptoms occurring together:

• Scarring hair loss on the scalp.
• Loss of hair in the armpits or groin (which is usually non-scarring).
• Small, rough, “spiny” bumps on the skin of the body, known as follicular papules ^[11][12].

Understanding the Rarity

If you feel like your local doctor was unfamiliar with LPP, you are likely correct. One clinical study reported the prevalence of LPP to be approximately 13.4 out of every 100,000 adults, though exact numbers vary by region and definition ^[13]. Because it is so rare, many general practitioners see only one or two cases in their entire career. This rarity highlights why it is important to work with a dermatologist who has specific experience in hair disorders.

Reframing the Goal of Treatment

The most important thing to understand about LPP treatment is what it can—and cannot—do. Because the stem cells are destroyed in scarred areas, treatment usually cannot regrow hair that has already been lost ^[14][15].

Instead, the primary goals of treatment are:

• Controlling Inflammation: The main priority is to suppress the immune system to protect healthy follicles ^[15].
• Symptom Relief: Reducing the itch, pain, or burning that often accompanies active disease ^[16].
• Stabilization: Achieving a state where the hair loss is no longer expanding, even if the existing patches remain ^[17].

While some patients may see a small amount of regrowth in areas that were only partially damaged (not yet fully scarred), your care team will focus on protecting the hair you still have ^[18]. Success in LPP treatment is measured by stability, not by a return to your original hair density.