Derm Dx: Red papule following puncture by rose thorn

A 58-year-old woman sought consultation in an emergency department because of a lesion on her finger that arose shortly after it was punctured by the thorn of a rose while gardening. Treatment with ciprofloxacin was initiated, but the site did not resolve and would bleed spontaneously. She denied fever, malaise, and elevated temperature. Examination of the affected area revealed a ...