title: A scaly macule on the bridge of the nose of a 15-year-old boy.
authors.affiliation: Department of Dermatology, University Hospital of Wales, Cardiff, United Kingdom.
authors.forename: M M
authors.initials: MM
authors.lastname: Chowdhury
authors.forename: H S
authors.initials: HS
authors.lastname: Inaloz
authors.forename: P J
authors.initials: PJ
authors.lastname: Holt
mesh_terms: D000293:Adolescent; D001707:Biopsy, Needle; D017679:Cryotherapy; D006801:Humans; D008297:Male; D009666:Nose; D017499:Porokeratosis / Q000175:diagnosis / Q000473:pathology* / Q000628:therapy*; D011379:Prognosis; D016896:Treatment Outcome