Periungual Bowen disease mimicking chronic paronychia and diagnosed by dermoscopy Jason Giacomel, MBBS, a Aimilios Lallas, MD, b Iris Zalaudek, MD, c and Giuseppe Argenziano, MD b Como, Australia; Graz, Austria; and Reggio Emilia, Italy CLINICAL PRESENTATION A 75-year-old woman, with Fitzpatrick skin phototype I/II and a history of nonmelanoma skin cancer presented with a scaly, fissured, erythematous, fairly well demarcated patch involving the periungual skin of the left index finger (Fig 1). The lesion had persisted for [1 year despite the use of antibiotic and corticosteroid ointments. The patient was immunocompetent, an exsmoker, with no reported history of arsenic ingestion, trauma, burns, or ionizing radiation to the site. DERMOSCOPIC APPEARANCE The dermoscopic images are shown in Fig 2. Fig 1. Clinical image. Squamous cell carcinoma in situ presenting as a fairly well demarcated, scaly, erythematous patch involving the periungual skin of the patient’s left index finger. No onycholysis or nail plate destruction can be seen. From Skin Spectrum Medical Services, a Como, Western Australia; the Skin Cancer Unit, b Arcispedale Santa Maria Nuova IRCCS, Reggio Emilia; and the Department of Dermatology, c Medical University of Graz. Funding sources: None. Conflicts of interest: None declared. Correspondence to: Jason Giacomel, MBBS, Skin Spectrum Medical Services, Como 6152, Western Australia, Australia. E-mail: jasongiacomel@gmail.com. J Am Acad Dermatol 2014;71:e65-7. 0190-9622/$36.00 ª 2014 by the American Academy of Dermatology, Inc. http://dx.doi.org/10.1016/j.jaad.2014.01.894 e65