A 43-year-old man presented with a 1-year history of asymptomatic wart-like lesion on the left third finger. There was no history of trauma. Gentle paring of the lesion revealed a translucent core. A small amount of clear exudate came out of the lesion after the surface was pared.
On microscopic examination, the punch biopsy of the skin lesion showed a perforation of the epidermis with underlying dermis showing a well circumscribed bony nodule (Figures 1 & 2)