Perirectal abscess: A pus-filled cavity that develops in the anal opening. The inflammation can be caused by injury to the anal area which can lead to bacteria entering the anal skin. The injury may be related to such things as anal fissures, hemorrhoids.
Proctitis: A chronic inflammatory disease of the rectum which causes bloody diarrhea.
Prostatic abscess: A pus-filled cavity in the prostate. It often occurs as a complication of infections such as prostatitis, urethritis, epididymitis and cystitis. The infection is most likely to occur in diabetics and immunocompromised people.