Can you identify this asymptomatic growth?

One year ago, a 34-year-old woman cut her thumb with a knife while preparing dinner. This asymptomatic growth has developed at the site. She has no other lesions.

What is your diagnosis?

A. Blastomycosis.

B.Sporotrichosis.

C.Mycobacterium marinum infection.

D.Verruca.

E.Bowen’s disease.

(Answer on next page.)

Answer: Verruca

The wart-like appearance of this patient’s lesion can suggest any of the diagnoses in the differential. However, blastomycosis, sporotrichosis, and Mycobacterium marinum infection often produce tender eruptions, and a Bowen’s lesion frequently bleeds with minimal trau- ma. This lesion was asymptomatic, and it did not bleed.

The finger cut created a portal for the virus that caused this verruca, D. Cryosurgery eradicated the wart.