oligotrichia

hy·po·tri·cho·sis

(hī'pō-tri-kō'sis),
A less than normal amount of hair on the head and/or body.
[hypo- + G. trichōsis, hairiness]

oligotrichia

(ŏl″ĭ-gō-trĭk′ē-ă) [″ + thrix, hair]
Congenital scantiness of hair.