What’s fishy about this nodule? – Let’s diagnose

A 43-year-old woman visited her doctor about a smooth nodule that developed on her right hand 2 weeks ago. On examination, a tender, erythematous plaque with an ulcer was seen on her right dorsal hand. The patient had no recent travel history. She recalled injuring her hand a few weeks ago in the process of cleaning out her fresh-water fish tank. The patient was immunosuppressed, with a history of renal transplantation. She was asymptomatic and appeared well.

What’s the diagnosis?

  1. Mycobacterium chelonae infection
  2. Cutaneous pheohyphomycosis
  3. Mycobacterium marinum infection
  4. Foreign body granuloma

Use the Differential Builder in VisualDx to help you.

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