Make the Diagnosis: A Painful, Deep Pustule: Part of a Bigger Problem?

(MedPage Today) -- Case Findings: A 55-year-old man with a history of inflammatory bowel disease reported a very painful, deep-seated pustule on his leg that looked like it might eventually rupture. He also had a fever and some arthralgia, but he wasn ' t sure if they were related. Can you diagnose the patient?
Source: MedPage Today Dermatology - Category: Dermatology Source Type: news