Chancroid is another rare bacterial infection caused by Haemophilus ducreyi. It is rarely found in the U.S. but frequently found in 3rd world countries among sex workers. It is characterized by a painful ulcer (unlike LGV or syphilis). Most individuals in the U.S. who’ve contracted chancroid have visited countries where the disease is endemic.
The sore varies in size from 1/8 of an inch to 2 inches in diameter and makes its appearance 1-14 days after exposure to the bacterium. The base of the sore bleeds easily if scraped or traumatized. Unlike genital herpes it occurs as a single lesion. Moreover, a culture for HSV will be negative. It tends to occur on the labia minor in women as well as the opening of the vagina.
The disease is treated with antibiotics and typically responds well once the diagnosis has been made. To learn more about the disease click on one of these websites.