title: JAAD Grand Rounds quiz. Solitary violaceous plaque on an adult's shoulder.
authors.forename: Jason W
authors.initials: JW
authors.lastname: Suszko
authors.forename: Amor
authors.initials: A
authors.lastname: Khachemoune
authors.forename: Alexander T
authors.initials: AT
authors.lastname: Ocampo
authors.forename: Khoa
authors.initials: K
authors.lastname: Ngyen
mesh_terms: D001707:Biopsy, Needle; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D018442:Lymphoma, B-Cell, Marginal Zone / Q000175:diagnosis / Q000473:pathology*; D008875:Middle Aged; D012782:Shoulder; D012871:Skin Diseases / Q000473:pathology*; D012878:Skin Neoplasms / Q000175:diagnosis / Q000473:pathology*; D056164:Teaching Rounds