A 22-year-old patient is evaluated in the clinic for reports of severe constipation and pain during defecation. The patient also reports blood on the toilet paper. Fast medical history is unremarkable. On visualization of the anus there is a slight red, moist-appearing protrusion from the anus that grows larger when the patient bears down. On digital rectal examination, an enlarged tender area on the posterior side is palpated. There is some blood on the glove after the examination. What disorder of the anus or rectum best fits this presentation?