title: Dermoscopy of black-spot poison ivy.
abstract: Black-spot poison ivy is an uncommon presentation of poison ivy (Toxicodendron) allergic contact dermatitis. A 78-year-old sought evaluation of a black spot present on her right hand amid pruritic vesicles. The presentation of a black spot on the skin in a clinical context suggesting poison ivy is indicative of black-spot poison ivy. Dermoscopy revealed a jagged, centrally homogeneous, dark brown lesion with a red rim. A skin sample was obtained and compared against a poison ivy standard using ultra-fast liquid chromatography-tandem mass spectrometry (UFLC-MS/MS). This finding confirmed the presence of multiple urushiol congeners in the skin sample. Black-spot poison ivy may be added to the list of diagnoses that show a specific dermoscopic pattern.
authors.affiliation: Stoecker & Associates, LLC, Rolla, Missouri, USA.
authors.forename: Ryan K
authors.initials: RK
authors.lastname: Rader
authors.forename: Ruipu
authors.initials: R
authors.lastname: Mu
authors.forename: Honglan
authors.initials: H
authors.lastname: Shi
authors.forename: William V
authors.initials: WV
authors.lastname: Stoecker
authors.forename: Kristen A
authors.initials: KA
authors.lastname: Hinton
mesh_terms: D000368:Aged; D002396:Catechols / Q000737:chemistry; D011040:Dermatitis, Toxicodendron / Q000150:complications / Q000175:diagnosis*; D046169:Dermoscopy; D005260:Female; D006801:Humans; D013058:Mass Spectrometry; D010859:Pigmentation Disorders / Q000209:etiology; D012880:Skin Pigmentation
chemical_list: D002396:Catechols; C003747:urushiol