Hypotrichosis

Hypotrichosis is the state of having a less than normal amount of hair on the head or body. There are a number of causes, including hereditary hair follicle dysplasias, inflammation or infection of the hair follicles, neoplastic destruction, irradiation. Alopecia is a term that is used as an inexact synonym.

Hypotrichosis is a common feature of Hallermann-Streiff syndrome as well as others.