Scarring alopecia is a group of hair loss disorders in which inflammation permanently destroys hair follicles and replaces them with scar tissue. Unlike common pattern baldness or temporary shedding, the damage is irreversible: once a follicle is gone, it cannot regrow hair. The key to managing scarring alopecia is catching it early enough to stop the inflammation before more follicles are lost.
How Scarring Alopecia Destroys Hair Follicles
Every hair follicle contains stem cells in a region called the “bulge,” which is the follicle’s regeneration engine. These stem cells are what allow hair to cycle through growth, rest, and shedding phases over and over throughout your life. In scarring alopecia, inflammation targets this bulge region specifically and destroys those stem cells. Once they’re gone, the follicle loses its ability to regenerate. The body fills the space with fibrous tissue, essentially forming a small scar where a functioning follicle used to be.
This process can be slow or fast depending on the type of scarring alopecia, but the end result is the same: patches of smooth, shiny skin where no hair openings (follicular ostia) remain. The inflammation typically resolves on its own once all the hair in an affected area has been destroyed and replaced with scar tissue, which is why early treatment matters so much.
Primary vs. Secondary Scarring Alopecia
Dermatologists divide scarring alopecia into two categories. In primary scarring alopecia, the hair follicle itself is the main target of the inflammatory attack. This is usually driven by an autoimmune process where the body’s immune system turns against its own follicles. In secondary scarring alopecia, the follicles are destroyed as collateral damage from something else entirely: burns, radiation, physical trauma, or cancer that has spread to the scalp. When people refer to “scarring alopecia” without further detail, they typically mean the primary type.
The Most Common Types
Several distinct conditions fall under the scarring alopecia umbrella, each with its own pattern and population it tends to affect.
Central Centrifugal Cicatricial Alopecia (CCCA)
CCCA is the most well-studied form and predominantly affects women of African descent, with a female-to-male ratio of about 3 to 1. It begins at the crown of the scalp and spreads outward in a circular pattern. A large U.S. study documented scarring hair loss at the vertex (mostly presumed to be CCCA) in 5.6% of the population studied. While it’s most commonly diagnosed in adults, research shows symptom onset can begin as young as 11 to 15 years old, with an average around age 14. Biopsy findings in CCCA typically show follicular scarring, fibroplasia, thinning of the outer root sheath, and inflammatory infiltrates that confirm an active scarring process.
Lichen Planopilaris (LPP)
LPP causes patchy hair loss on the scalp along with significant discomfort, including pain, itching, and burning. Under a microscope, it shows a specific type of inflammation called lichenoid inflammation around the hair follicles. It can appear anywhere on the scalp and tends to affect middle-aged women more often, though it can occur in anyone.
Frontal Fibrosing Alopecia (FFA)
FFA is considered a variant of LPP but has a distinctive pattern: it causes the hairline to recede progressively along the forehead and temples. It can also affect eyebrows and body hair. FFA has been increasing in frequency over the past two decades for reasons that are not well understood.
What It Feels Like
Scarring alopecia doesn’t always announce itself with dramatic hair loss right away. Many people first notice scalp symptoms before the hair loss becomes obvious. Itching, burning, and tenderness are common early signs, driven by the underlying inflammation. You might feel a constant sense of irritation in one area of your scalp.
Visible signs include redness around hair follicles, small pus-filled bumps (follicular pustules), and scaling. As the condition progresses, you’ll notice areas of smooth, shiny skin where hair has stopped growing. These patches may be pale or white and feel different from the surrounding scalp. The edges of bald patches, where active inflammation is still working, are often the most symptomatic areas.
How It’s Diagnosed
Dermatologists follow a systematic approach. The first step is categorizing the pattern of hair loss: patchy, patterned, or diffuse. The second step distinguishes scarring from non-scarring alopecia. The hallmark of scarring alopecia is the absence of follicular ostia, the tiny openings in the skin where hair normally emerges. In non-scarring conditions like alopecia areata, those openings remain even where hair has fallen out.
Trichoscopy, a magnified examination of the scalp, plays a central role. It allows dermatologists to see whether follicular openings are present, identify specific patterns of inflammation, and often reach a diagnosis without needing a biopsy. Each subtype of scarring alopecia has distinctive features visible under magnification.
Histopathology (a scalp biopsy examined under a microscope) remains the gold standard and is the basis for classifying scarring alopecia into subtypes based on whether the inflammation is driven by lymphocytes, neutrophils, or a mix of both. However, because biopsies are invasive and their accuracy depends on selecting the right spot, they’re now reserved mainly for ambiguous cases. In many situations, an experienced dermatologist can make a confident diagnosis with clinical examination and trichoscopy alone.
Can Lost Hair Grow Back?
The straightforward answer is that hair regrowth in scarring alopecia is uncommon. Since the stem cells responsible for hair regeneration are permanently destroyed, follicles that have been replaced by scar tissue cannot produce hair again. This is what makes scarring alopecia fundamentally different from conditions like alopecia areata, where follicles remain intact and regrowth is possible.
There are rare exceptions. Some cases of scarring alopecia associated with lupus have shown limited regrowth when the condition was caught very early, before the follicles were fully destroyed. The critical factor appears to be timing. In recent-onset disease, some follicles may still have surviving stem cells that can recover if inflammation is controlled quickly enough. This is why early recognition is repeatedly emphasized: you cannot reverse the damage, but you can prevent more of it.
Treatment Goals and Options
Because lost follicles cannot be restored, the primary goal of treatment is stopping inflammation to preserve the hair you still have. Treatment is considered successful when the disease becomes inactive, meaning no new hair loss, no symptoms, and no signs of ongoing inflammation on trichoscopy.
Most treatment plans center on reducing the immune-driven inflammation attacking the follicles. This typically involves anti-inflammatory medications applied to the scalp or taken orally, depending on how active and widespread the disease is. Steroid injections into the affected areas are commonly used to calm localized inflammation. For more aggressive or widespread disease, systemic medications that modulate the immune response may be necessary.
There are currently no published randomized controlled trials or established clinical guidelines for treating CCCA, the most common form. A 2024 Delphi consensus survey gathered treatment recommendations from 21 dermatologists with expertise in hair disorders, but the field still relies heavily on clinical experience rather than large-scale evidence. Newer procedural options like platelet-rich plasma (PRP) injections and low-level light therapy have shown some potential as add-on treatments in small case reports. Low-level light therapy, for example, is thought to reduce inflammation through effects on cellular energy production. However, the evidence for these approaches remains very limited.
For areas where hair loss is already permanent and the disease is no longer active, some people explore hair transplantation. This is only an option once inflammation has been fully controlled for a sustained period, because transplanting hair into an actively inflamed scalp will result in the new follicles being destroyed as well. Wigs, hairpieces, and scalp micropigmentation are other options people use to manage the cosmetic impact while treatment addresses the underlying disease.