title: Renbök phenomenon in alopecia areata.
abstract: We present a second case of alopecia areata sparing a congenital nevus of the eyebrow. This inverse counterpart of perinevoid alopecia is discussed and placed in context to the recently described Renbök phenomenon. According to the present definition of a nevus as a genetic mosaic, a genetically determined resistance to alopecia areata is suggested in our case.
authors.affiliation: Kantonsspital, St. Gallen, Switzerland.
authors.forename: A M
authors.initials: AM
authors.lastname: Bon
authors.forename: R
authors.initials: R
authors.lastname: Happle
authors.forename: P H
authors.initials: PH
authors.lastname: Itin
mesh_terms: D000293:Adolescent; D000506:Alopecia Areata / Q000473:pathology*; D005138:Eyebrows / Q000473:pathology*; D006801:Humans; D008297:Male; D009508:Nevus, Pigmented / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*