Doctor, my armpit hair has turned yellow!: Malodorous yellowish axillary hair in an adolescent patient

A male aged 15 years presented with a one-month history of malodorous, dirty-looking, yellowish hair over both axillae. The area of affected hair had increased progressively, with associated development of itch and discomfort. Creamy yellow concretions involving several hair shafts were also observed. Polarised contact dermoscopy of pulled hairs showed yellowish and white cotton-like structures surrounding the hair sheath. Affected hairs removed for bacterial and fungal culture and Wood's lamp study revealed yellowish fluorescence covering the hair shaft. Topical clindamycin 1% twice a day was recommended with good response.