Subungual Eccrine Poroma: An Unusual Location

Area of Science:

• Dermatology
• Oncology

Background:

• Eccrine poroma is a rare benign adnexal tumor originating from eccrine sweat ducts.
• Subungual eccrine poroma is exceptionally rare, posing diagnostic and therapeutic challenges.

Observation:

• A 36-year-old female presented with a 5-year history of a slow-growing, asymptomatic, reddish subungual mass.
• Onychoscopy revealed a reddish-pink homogenous area with keratotic borders, reddish globules, and dotted vessels.

Findings:

• Histopathological examination confirmed the diagnosis of eccrine poroma.
• The patient experienced no recurrence over a 6-month follow-up period post-excision.

Implications:

• This case underscores the importance of considering eccrine poroma in the differential diagnosis of subungual tumors.
• Onychoscopy can assist in the diagnosis and differentiation of subungual masses, but histopathology remains definitive.