Granuloma inguinale accompanied by perianal skin ulceration due to the bacterium Calymmatobacterium granulomatis. The ulcerations are for the most part painless, and granulomatous in nature, i.e. chronic inflammation. The C. granulomatis bacterium is a bipolar, Gram negative organism, previously name Donovania granulomatis. (Courtesy of the Center for Disease Control, Dr. Thomas F. Sellers, Emory University.)