Subungual osteochondroma of the big toe: an uncommon presentation

Subungual osteochondroma is a rare benign bony tumor that typically affects the phalanges of the fingers or toes, most frequently the distal phalanx of the big toe.We report a new observation of a 15-year-old female who presented with a slowly growing mass beneath the nail of her right great toe, causing anonychia and pain.Clinical and dermoscopic examination revealed an erythematous ulcerating tumor.Given these non-specific signs, pyogenic granuloma, osteochondroma, squamous cell carcinoma, and amelanotic melanoma were considered.Excisional biopsy confirmed osteochondroma, which was surgically removed, and a hydrocolloid dressing was applied.At 6-month follow-up, she showed lateral onycholysis and hyperkeratosis treated with urea cream, with no signs of recurrence.