DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Traction alopecia of the scalp. Bald scalp of a 12-year-old boy caused by traction alopecia. Traction alopecia is a gradual loss of hair due to force being continually applied to the hair. This hair loss results from trichotillomania, a compulsive disorder where patients have a strong urge to pull on and pluck hairs, leading to hair loss that can sometimes be permanent.
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