title: Red scalp hair turning dark-brown at 50 years of age.
abstract: We report on a man whose scalp hair was reddish since childhood but changed into dark-brown after the age of 50. His pubic hair and beard remained carrot coloured. A high level of arsenic in his scalp hair seemed to be a possible cause of the change from pheomelanogenesis to eumelanogenesis.
mesh_terms: D001151:Arsenic / Q000032:analysis / Q000494:pharmacology*; D006197:Hair / Q000032:analysis; D006200:Hair Color / Q000187:drug effects*; D006801:Humans; D008297:Male; D008543:Melanins / Q000378:metabolism; D008875:Middle Aged
chemical_list: D008543:Melanins; C018362:pheomelanin; C041877:eumelanin; D001151:Arsenic