You are seeing a 30-year-old female in a primary care setting who is complaining of pain when defecating for the last 2 weeks. She describes the pain as sharp when passing a stool which is followed by a deep burning pain that persists for several hours afterwards. She also informs you that there is a small quantity of bright red blood on the toilet paper when wiping. The patient has a past medical history of IBD. What is the most likely diagnosis?