Korean J Dermatol.
2022 Sep;60(8):517-521.
Two Cases of Subungual Epidermoid Cyst
- Affiliations
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- 1Department of Dermatology, Pusan National University School of Medicine, Yangsan, Korea
- 2Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
Abstract
- Epidermal cysts are the most common cutaneous cysts that originate from the hair follicles. Therefore, they are rarely found in areas without hair follicles, such as the palms, soles, and subungual areas. Herein, we reported two cases of subungual epidermoid implantation cysts. The first patient was a 52-year-old male who presented with onycholysis and a subungual white mass on the middle fingernail of the right hand. The second patient was a 67-year-old male who presented with an erythematous patch and swelling of the proximal nail fold of the right thumb. Ultrasonography revealed bone erosion and a round-to-elliptical mass with internal avascularity. Heterogeneous echogenicity and internal echogenic foci were detected in both patients. After nail avulsion, a skin-colored mass was observed. Histopathological examination revealed typical epidermal cysts in both patients. Herein, we report two rare cases of subungual epidermoid implantation cysts.
