(See also Overview of Sexually Transmitted Diseases.)
Granuloma inguinale is a rare sexually transmitted disease caused by the bacteria Klebsiella granulomatis. It leads to chronic inflammation and scarring of the genitals.
Granuloma inguinale typically causes a painless, red lump on or near the genitals, which slowly enlarges, then breaks down to form a sore.
Doctors suspect the infection if people have typical symptoms and live in areas where the infection occurs, and doctors confirm the diagnosis by examining a sample of fluid scraped from the sore.
Treatment with antibiotics is usually effective.
Granuloma inguinale is extremely rare in developed countries but still occurs in Papua New Guinea, Australia, southern Africa, the Caribbean, and parts of Brazil and India.
Symptoms of granuloma inguinale usually begin 1 to 12 weeks after infection. The first symptom is a painless, red nodule that slowly enlarges into a round, raised lump. The lump then breaks down to form a sore near the site of the initial infection:
The sores slowly enlarge and spread to nearby tissue, causing further damage. Sores may also spread when they come into contact with other areas of the body. Without treatment, the sores continue to spread.
Occasionally, the infection spreads to lymph nodes in the groin, causing them to swell, or spreads through the bloodstream to the bones, joints, or liver.
Granuloma inguinale is suspected in people who live in areas where the infection occurs and who have sores typical of the infection.
To confirm the diagnosis, doctors take a sample of fluid scraped from the sore and examine it under a microscope.
If the diagnosis is unclear, doctors take a sample of tissue and examine it under a microscope (biopsy).
The following general measures can help prevent granuloma inguinale (and other sexually transmitted diseases):
Regular and correct use of condoms (see How to Use a Condom)
Avoidance of unsafe sex practices, such as frequently changing sex partners or having sexual intercourse with prostitutes or with partners who have other sex partners
Prompt diagnosis and treatment of the infection (to prevent spread to other people)
Identification of the sexual contacts of infected people, followed by counseling or treatment of these contacts
Not having sex (anal, vaginal, or oral) is the most reliable way to prevent STDs but is often unrealistic.
Trimethoprim-sulfamethoxazole, doxycycline, erythromycin, ciprofloxacin, or azithromycin taken by mouth for at least 3 weeks is effective. Sometimes antibiotics are given by injection into a muscle or vein.
When treated, people usually begin to improve within 7 days. However, if the infection has spread to nearby lymph nodes in the groin, healing may be slow and lumps may recur. Then, treatment is required for a longer time. After treatment appears successful, people should be checked periodically for 6 months.
Current sex partners should be examined and, if infected, treated.