Chancroid is a bacterial infection that is spread through sexual contact.
Chancroid is caused by a bacteria called Haemophilus ducreyi.
The infection is found in many parts of the world, such as Africa and southwest Asia. Very few people are diagnosed in the United States each year with this infection. Most people in the U.S. who are diagnosed with chancroid have traveled outside the country to areas where the infection is more common.
Within 1 day to 2 weeks after getting chancroid, a person will get a small bump in the genitals. The bump becomes an ulcer within a day after it first appears. The ulcer:
Ranges in size from 1/8 inch to 2 inches in diameter
Has sharply defined borders
Has a base that is covered with a gray or yellowish-gray material
Has a base that bleeds easily if it is banged or scraped
About half of infected men have only a single ulcer. Women often have four or more ulcers. The ulcers appear in specific locations.
In women, the most common location for ulcers is the outer lips of the vagina (labia majora). "Kissing ulcers" may develop. Kissing ulcers are those that occur on opposite surfaces of the labia.
Other areas, such as the inner vagina lips (labia minora), the area between the genitals and the anus (perineal area), and the inner thighs may also be involved. The most common symptoms in women are pain with urination and intercourse.
About half of the people who are infected with a chancroid develop enlarged inguinal lymph nodes. These are nodes located in the fold between the leg and the lower abdomen.
In half of people who have swelling of the inguinal lymph nodes, the nodes break through the skin and cause draining abscesses. The swollen lymph nodes and abscesses are also called buboes.
Exams and Tests
The health care provider diagnoses chancroid by looking at the ulcer(s) and checking for swollen lymph nodes. There is no blood test for chancroid.
The infection is treated with antibiotics. Large lymph node swellings need to be drained, either with a needle or local surgery.
Chancroid can get better on its own. Some people have months of painful ulcers and draining. Antibiotic treatment usually clears up the lesions quickly with very little scarring.
Complications include urethral fistulas and scars on the foreskin of the penis in uncircumcised males. Patients with chancroid should also be checked for other sexually transmitted infections, including syphilis, HIV, and genital herpes.
In persons with HIV, chancroid may take much longer to heal.
When to Contact a Medical Professional
Call for an appointment with your health care provider if:
You have symptoms of chancroid
You have had sexual contact with a person who you know has a sexually transmitted infection (STI)
You have engaged in high-risk sexual practices
Chancroid is spread by sexual contact with an infected person. Avoiding all forms of sexual activity is the only absolute way to prevent a sexually transmitted disease.
However, safe sex behaviors may reduce your risk. The proper use of condoms, either the male or female type, greatly decreases the risk of catching a sexually transmitted disease. You need to wear the condom from the beginning to the end of each sexual activity.
Murphy TF. Haemophilus species including H. influenzae and H. ducreyi (chancroid). In: In: Bennett JE, Dolin R, Mandell GL, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 8th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 227.
Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.