1. Hypertrichosis. This anomaly is characterized by the excessive hair. It may by localized or diffuse. Local hy-pertrichosis in -the lumbar region is usually associated with spina bifida oc-culta.
2. Pili torti. This is a congenital familial disorder of hair growth in which the hair are twisted and bent.
3. Alopecia. This anomaly is characterized by lack of hair. It results from the failure of hair follicles to develop
various types of alopecia have been described: alopecia areata (absence of hair in sharply defined areas, usually involving scalp or beard), alopecia to-talis (absence of hair on the entire skull), and alopecia universalis (absence of hair on the entire body).