Linear array of nodules on a patient's arm.
Largest lesion shows blood clot on site of punch biopsy.
A. Cat-scratch disease. B. Mycobacterium marinum infection. D. Tinea corporis. She noted that the first lesion appeared about a week after her cat had scratched her left arm. Sporotrichosis is a fungal infection caused by Sporothrix schenckii, a fungus that is commonly found on decaying vegetation and in the soil.