Cat Nip in an Immunocompromised Owner

A large, red, tender plaque developed after a cat bite in a woman with Crohn disease. What now?

A 27-year-old woman was petting her cat, when the animal suddenly bit her on the arm. She immediately rinsed copiously with isopropyl alcohol and applied an over-the-counter antibiotic ointment. However, 12 hours later a large, red, swollen, and exquisitely tender plaque had developed around the bite site. The patient was being treated for Crohn disease. She calls you for advice.

What is the most prudent step?