title: Unilateral localized failure of beard growth.
abstract: Hair may be classified by type as vellus or terminal. The transformation of vellus follicles into terminal follicles is induced by androgens in androgen-dependent areas by promoting the genetic program existing within individual follicles. Patients with normal androgen plasma levels and absent hair growth in certain areas under androgenic control have been described. One explanation of this condition may be abnormal target tissue sensitivity. We report a 17-year-old man whose only complaint was inability to grow a beard on the left side of his face.
authors.affiliation: Servicio de Dermatología, Hospital Ramón y Cajal, Universidad de Alacalá, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Núñez
authors.forename: E S
authors.initials: ES
authors.lastname: Mirallles
authors.forename: J M
authors.initials: JM
authors.lastname: Arrazola
authors.forename: A
authors.initials: A
authors.lastname: Ledo
mesh_terms: D000293:Adolescent; D000728:Androgens / Q000097:blood / Q000502:physiology; D004817:Epidermis / Q000473:pathology; D005145:Face; D005500:Follow-Up Studies; D006197:Hair / Q000002:abnormalities* / Q000473:pathology; D018859:Hair Follicle / Q000002:abnormalities / Q000473:pathology; D006801:Humans; D008297:Male; D011627:Puberty; D012867:Skin / Q000473:pathology
chemical_list: D000728:Androgens