title: A slightly erythematous, firm papule on the upper arm--quiz case.
authors.affiliation: Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
authors.forename: Sarvenaz
authors.initials: S
authors.lastname: Zand
authors.forename: Peter A
authors.initials: PA
authors.lastname: Lio
authors.forename: Bonnie T
authors.initials: BT
authors.lastname: Mackool
authors.forename: Lyn M
authors.initials: LM
authors.lastname: Duncan
mesh_terms: D000368:Aged; D001132:Arm; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D018328:Melanoma, Amelanotic / Q000473:pathology* / Q000601:surgery; D021701:Sentinel Lymph Node Biopsy; D012878:Skin Neoplasms / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome