Biphasic Alopecia

    P. Assouly, C. Lacoste, B. Cavelier‐Balloy
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    TLDR Biphasic alopecia often leads to permanent hair loss and its progression varies widely among individuals.
    The document discusses biphasic alopecia, a type of hair loss that can become scarring over time. It mentions that traumatic alopecia can occur due to hair pulling from ponytails, buns, braids, etc., causing pain, inflammation, and folliculitis. Dermatoscopy of biphasic alopecia does not present any specific characteristics, but a progressive disappearance of hair follicles is noted, similar to all scarring alopecia. The document emphasizes the importance of a good relationship between clinicians and pathologists in the field of biphasic alopecia. It also states that the chances of hair regrowth in biphasic alopecia are compromised due to its scarring nature. In some cases, it might be possible to halt the progression, especially in traumatic alopecia. The document concludes by stating that the biphasic evolution of alopecia is common and poorly defined, with some alopecia quickly becoming scarring, some never, and some becoming so over time.
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