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| | Alopecia: Hair Disorders: Merck Manual Professional |
 | | Traction alopecia is hair loss primarily at the frontal and/or temporal hairline due to traction from braids, rollers, or ponytails. |
 | | Except in alopecia areata (see Hair Disorders: Alopecia Areata), some cases of infection (kerion, syphilis), lichen planus, and dissecting cellulitis of the scalp (folliculitis abscedens et suffodiens), signs of hair loss are nondiagnostic. |
 | | Alopecia areata is thought to be an autoimmune disease affecting genetically susceptible people exposed to unclear environmental triggers, such as infection or emotional stress. |
| www.merck.com /mmpe/sec10/ch124/ch124b.html (0 words) |
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