A 25-year-old man presents with a 3-month history of crampy abdominal pain and bloody diarrhea and a 3-week history of multiple red and tender lesions of the forearms. His past medical history is notable for low back pain, worse in the morning. What is the most likely underlying cause for his skin condition?
a. Sarcoidosis
b. Psoriasis
c. Yersinia enterocolitica infection
d. Medication
e. Inflammatory bowel disease