MSFinals-0820

A 54-year-old patient presented to the general practitioner with complaints of bloody diarrhoea that has persisted for the past 6 months. The patient also reported experiencing fever, weight loss, abdominal pain, and a painful, erythematosus rash on the anterior surface of the leg. A positive faecal occult blood test was obtained, and colonoscopy revealed crypt abscesses. What type of skin lesion is frequently observed in this patient?