Chancroid (also known as soft chancre and 'ulcus molle') 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. After an incubation period of one day to two weeks, chancroid begins with a small bump that becomes an ulcer within a day of its appearance. The ulcer characteristically: In more specific terms, the CDC's standard clinical definition for a probable case of chancroid includes all of the following: About half of infected men have only a single ulcer. Women frequently have four or more ulcers, with fewer symptoms. The ulcers appear in specific locations, such as the coronal sulcus of the uncircumcised glans penis in men, or the fourchette and labia minora in women. In women, the most common location for ulcers is the labia majora. 'Kissing ulcers' may develop. These are ulcers that occur on opposing surfaces of the labia.
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