title: Dermoscopic features of hidroacanthoma simplex: Usefulness in distinguishing it from Bowen's disease and seborrheic keratosis.
abstract: Hidroacanthoma simplex (HAS) is a rare benign eccrine adnexal tumor. HAS is sometimes clinically or pathologically misdiagnosed as squamous cell carcinoma in situ (Bowen's disease; BD), seborrheic keratosis (SK) or other adnexal tumor. To date, there has never been a report focusing on dermoscopic features to distinguish HAS from BD and SK. We found the following dermoscopic findings to be characteristic of HAS: fine black dots/globules (75% of cases) and fine scales arranged annularly (100% of cases). In contrast, glomerular vessels, which are typically observed in BD, were not seen in any of the four cases. Cerebriform appearance and milia-like cysts, which are typically observed in SK, were also not seen in any of the four cases. The existence of "scattered fine black dots/globules" and "fine scales arranged annularly", and the absence of the glomerular vessels, may contribute to precise diagnosis of HAS. Even though HAS resembles BD or SK clinically, it can be distinguished from these by the characteristic dermoscopic features.
authors.affiliation: Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Shiiya
authors.affiliation: Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
authors.forename: Hiroo
authors.initials: H
authors.lastname: Hata
authors.affiliation: Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
authors.forename: Yuka
authors.initials: Y
authors.lastname: Inamura
authors.affiliation: Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Imafuku
authors.affiliation: Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Kitamura
authors.affiliation: Department of Surgical Pathology, Hokkaido University Hospital, Sapporo, Japan.
authors.forename: Hiromi
authors.initials: H
authors.lastname: Fujita
authors.affiliation: Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shimizu
mesh_terms: D000368:Aged; D001913:Bowen's Disease / Q000175:diagnosis; D012628:Dermatitis, Seborrheic / Q000175:diagnosis; D046169:Dermoscopy; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D057091:Poroma / Q000175:diagnosis* / Q000473:pathology
keywords: Bowen's disease; dermoscopy; diagnosis; hidroacanthoma simplex; seborrheic keratosis