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Other namesSoft chancre[1] and Ulcus molle[2]
Chancroid lesion haemophilus ducreyi PHIL 3728 lores.jpg
A chancroid lesion on penis
SpecialtyInfectious disease Edit this on Wikidata

Chancroid (/ˈʃæŋkrɔɪd/ SHANG-kroyd) is a bacterial sexually transmitted infection characterized by painful sores on the genitalia. Chancroid is known to spread from one individual to another solely through sexual contact. While uncommon in the western world, it is the most common cause of genital ulceration worldwide.

Signs and symptoms[edit]

Buboes in a male

These are only local and no systemic manifestations are present.[3] The ulcer characteristically:

  • Ranges in size dramatically from 3 to 50 mm (1/8 inch to two inches) across
  • Is painful
  • Has sharply defined, undermined borders
  • Has irregular or ragged borders
  • Has a base that is covered with a gray or yellowish-gray material
  • Has a base that bleeds easily if traumatized or scraped
  • painful swollen lymph nodes occurs in 30 to 60% of patients.
  • dysuria (pain with urination) and dyspareunia (pain with intercourse) in females

About half of infected men have only a single ulcer. Women frequently have four or more ulcers, with fewer symptoms.

The initial ulcer may be mistaken as a "hard" chancre, the typical sore of primary syphilis, as opposed to the "soft chancre" of chancroid.

Approximately one-third of the infected individuals will develop enlargements of the inguinal lymph nodes, the nodes located in the fold between the leg and the lower abdomen.

Half of those who develop swelling of the inguinal lymph nodes will progress to a point where the nodes rupture through the skin, producing draining abscesses. The swollen lymph nodes and abscesses are often referred to as buboes.


  • Extensive adenitis may develop.
  • Large inguinal abscesses may develop and rupture to form draining sinus or giant ulcer.
  • Superinfection by Fusarium and Bacteroides. These later require debridement and may result in disfiguring scars.
  • Phimosis can develop in long standing lesion by scarring and thickening of foreskin, which may subsequently require circumcision.




Chancroid is a bacterial infection caused by the fastidious Gram-negative streptobacillus Haemophilus ducreyi. It is a disease found primarily in developing countries, most prevalent in low socioeconomic groups, associated with commercial sex workers.

Chancroid, caused by H. ducreyi has infrequently been associated with cases of Genital Ulcer Disease in the US, but has been isolated in up to 10% of genital ulcers diagnosed from STD clinics in Memphis and Chicago.[4]

Infection levels are very low in the Western world, typically around one case per two million of the population (Canada, France, Australia, UK and US).[citation needed] Most individuals diagnosed with chancroid have visited countries or areas where the disease is known to occur frequently, although outbreaks have been observed in association with crack cocaine use and prostitution.[citation needed]

Chancroid is a risk factor for contracting HIV, due to their ecological association or shared risk of exposure, and biologically facilitated transmission of one infection by the other. Approximately 10% of people with chancroid will have a co-infection with syphilis and/or HIV.


H. ducreyi enters skin through microabrasions incurred during sexual intercourse. A local tissue reaction leads to development of erythomatous papule, which progresses to pustule in 4–7 days. It then undergoes central necrosis to ulcerate.[5]



Some of clinical variants are as follows.[5]

Variant Characteristics
Dwarf chancroid Small, superficial, relatively painless ulcer.
Giant chancroid Large granulomatous ulcer at the site of a ruptured inguinal bubo, extending beyond its margins.
Follicular chancroid Seen in females in association with hair follicles of the labia majora and pubis; initial follicular pustule evolves into a classic ulcer at the site.
Transient chancroid Superficial ulcers that may heal rapidly, followed by a typical inguinal bubo.
Serpiginous chancroid Multiple ulcers that coalesce to form a serpiginous pattern.
Mixed chancroid Nonindurated tender ulcers of chancroid appearing together with an indurated nontender ulcer of syphilis having an incubation period of 10 to 90 days.
Phagedenic chancroid Ulceration that causes extensive destruction of genitalia following secondary or superinfection by anaerobes such as Fusobacterium or Bacteroides.
Chancroidal ulcer Most often a tender, nonindurated, single large ulcer caused by organisms other than Haemophilus ducreyi; lymphadenopathy is conspicuous by its absence.

Laboratory findings[edit]

From bubo pus or ulcer secretions, H. ducreyi can be identified using special culture media; however, there is a <80% sensitivity. PCR-based identification of the organisms is available, but none in the United States are FDA-cleared.[6] Simple, rapid, sensitive and inexpensive antigen detection methods for H. ducreyi identification are also popular. Serologic detection of H. ducreyi uses outer membrane protein and lipooligosaccharide.

Differential diagnosis[edit]

CDC's standard clinical definition for a probable case of chancroid
# Patient has one or more painful genital ulcers. The combination of a painful ulcer with tender adenopathy is suggestive of chancroid; the presence of suppurative adenopathy is almost pathognomonic.
  1. No evidence of Treponema pallidum infection by darkfield microscopic examination of ulcer exudate or by a serologic test for syphilis performed greater than or equal to 7 days after onset of ulcers and
  2. Either a clinical presentation of the ulcer(s) not typical of disease caused by herpes simplex virus (HSV) or a culture negative for HSV.

Despite many distinguishing features, the clinical spectrums of following diseases may overlap with chancroid:

Practical clinical approach for this STI as Genital Ulcer Disease is to rule out top differential diagnosis of Syphilis and Herpes and consider empirical treatment for Chancroid as testing is not commonly done for the latter.

Comparison with syphilis[edit]

There are many differences and similarities between the conditions syphilitic chancre and chancroid.

  • Both originate as pustules at the site of inoculation, and progress to ulcerated lesions
  • Both lesions are typically 1–2 cm in diameter
  • Both lesions are caused by sexually transmissible organisms
  • Both lesions typically appear on the genitals of infected individuals
  • Both lesions can be present at multiple sites and with multiple lesions
  • Chancre is a lesion typical of infection with the bacterium that causes syphilis, Treponema pallidum
  • Chancroid is a lesion typical of infection with the bacterium Haemophilus ducreyi
  • Chancres are typically painless, whereas chancroid are typically painful
  • Chancres are typically non-exudative, whereas chancroid typically have a grey or yellow purulent exudate
  • Chancres have a hard (indurated) edge, whereas chancroid have a soft edge
  • Chancres heal spontaneously within three to six weeks, even in the absence of treatment
  • Chancres can occur in the pharynx as well as on the genitals


Chancroid spreads in populations with high sexual activity, such as prostitutes. Use of condom, prophylaxis by azithromycin, syndromic management of genital ulcers, treating patients with reactive syphilis serology are some of the strategies successfully tried in Thailand.[5]


The CDC recommendation for chancroid is either a single oral dose (1 gram) of azithromycin, a single IM dose (250 mg) of ceftriaxone, oral (500 mg) of erythromycin three times a day for seven days, or oral (500 mg) of Ciprofloxacin twice a day for three days.[6] Data is limited, but there has been reports of ciprofloxacin and erythromycin resistance. Treatment may include more than one prescribed medication.

Aminoglycosides such as Gentamicin, Streptomycin, and Kanamycin have been used to successfully treat Chancroid; however aminoglycoside-resistant strain of H. ducreyi have been observed in both laboratory and clinical settings.[7] Treatment with aminoglycosides should be considered as only a supplement to a primary treatment.

Pregnant and lactating women, or those below 18 years of age regardless of gender, should NOT use Ciprofloxacin as treatment for Chancroid. Treatment failure is possible with HIV co-infection and extended therapy is sometimes required.


Within 3-7 days after the beginning of treatment, patients should be re-examined to determine if therapy was successful. Within 3 days, symptoms of ulcers should improve. Healing time of the ulcer depends mainly on size and can take more than two weeks for larger ulcers. In uncircumcised men, healing will be slower if the ulcer is under the foreskin. Sometimes, needle aspiration or incision and drainage are necessary.[6]


Prognosis is excellent with proper treatment. Treating sexual contacts of affected individual helps break cycle of infection.


Although the prevalence of chancroid has decreased in the United States and worldwide, sporadic outbreaks can still occur in regions of the Caribbean and Africa. Like other sexually transmitted diseases, having chancroid increases the risk of transmitting and acquiring HIV. [6]


Chancroid has been known to humans since time of ancient Greeks.[7] Some of important events on historical timeline of chancre are:

Year Event
1852 Leon Bassereau distinguished chancroid from syphilis (i.e. soft chancre from hard chancre)
1890s Augusto Ducrey identified H. ducreyi
1900 Benzacon and colleagues isolated H. ducreyi
1970s Hammond and colleagues developed selective media


  1. ^ James, William D.; Berger, Timothy G.; et al. (2006). Andrews' Diseases of the Skin: clinical Dermatology. Saunders Elsevier. p. 274. ISBN 978-0-7216-2921-6.
  2. ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 978-1-4160-2999-1.
  3. ^ Medical Microbiology: The Big Picture. McGraw Hill Professional. 2008-08-05. p. 243. ISBN 9780071476614.
  4. ^ "Error 404 - Page Not Found". Retrieved 19 April 2018.
  5. ^ a b c CURRENT Diagnosis & Treatment of Sexually Transmitted Diseases. McGraw-Hill Companies, Inc. 2007. pp. 69–74. ISBN 9780071509619.
  6. ^ a b c d "2015 STD Treatment Guidelines". 2019-05-08. Retrieved 2019-08-02.
  7. ^ Sexually Transmitted Diseases (4th ed.). McGraw Hill Professional. 2007. pp. 689–698. ISBN 9780071417488.

External links[edit]

External resources