This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Pseudopelade of Brocq (PBB) is a slowly progressive, chronic condition characterized by scarring hair loss (cicatricial alopecia). There exists some controversy as to whether PBB is a distinct condition or the common final stage or variant of several different forms of scarring alopecias, such as discoid lupus erythematosus (DLE) or lichen planopilaris (LPP). PBB is classified into two categories depending on whether a scarring alopecia is present (burnt-out or end-stage scarring) or not (idiopathic).
The patches of hair loss present in PBB may be single or multiple. They are usually small, discrete, round or oval, and asymmetrical. The underlying skin is typically smooth, soft, and flesh-colored or white, with little, if any, inflammation. Although the exact cause of PBB has not been identified, it is believed to be an autoimmune disease. Other factors that may be involved include infections with Borrelia burgdorferi, the bacterium that causes Lyme disease and issues with the cells involved in hair growth (stem cell failure). There is no standard treatment for PBB. In the beginning of the disease process, certain medication, such as steroids, may be used in an effort to prevent further hair loss.
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