title: Tender erythematous papules on the elbows, buttocks and knees.
authors.affiliation: Department of Dermatology, St Vincent's University Hospital, Dublin, Ireland. ajryan99@gmail.com
authors.forename: A J A
authors.initials: AJ
authors.lastname: Ryan
authors.forename: B D
authors.initials: BD
authors.lastname: Hayes
authors.forename: K
authors.initials: K
authors.lastname: Sheahan
authors.forename: P
authors.initials: P
authors.lastname: Collins
mesh_terms: D001706:Biopsy; D002081:Buttocks / Q000473:pathology; D004550:Elbow / Q000473:pathology; D005260:Female; D006801:Humans; D007717:Knee / Q000473:pathology; D008875:Middle Aged; D012867:Skin / Q000473:pathology; D018366:Vasculitis, Leukocytoclastic, Cutaneous / Q000175:diagnosis* / Q000473:pathology