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Acute, localized autoinoculable infectious disease usually acquired through sexual contact. Caused by HAEMOPHILUS DUCREYI, it occurs endemically almost worldwide, especially in tropical and subtropical countries and more commonly in seaports and urban areas than in rural areas.

Soft or simple chancre; an infectious venereal ulcer, developing upon an inflamed edematous base from a pustule formed from a primary papule.

Resembling a chancre; a non infectious chancre.

Simple, soft, or non-infecting chancre; a disease propagated mainly by venereal infection, and characterized by the development of a virulent ulcer (also called C. or chaneroidal ulcer) situated usually upon the genitals, and the secretion from which is contagious, but does not give rise to a constitutional affection. The lesion of c. is originally a pustule which develops immediately after inoculation, rapidly enlarges, and then breaks down, forming an ulcer with non-indurated base, discharging pus. The lymphatic glands in the vicinity often are infected, becoming swollen and painful (chancroidal bubo), and frequently suppurate. The secretion of a c. or its bubo is auto-inoculable. C. is said to be caused by Bacillus ulceris cancrosi.

A soft, nonsyphilitic venereal sore.

A specific, local, contagious, auto-infectious, venereal ulcer, or that form of contagious venereal ulcer which is not accompanied by constitutional syphilitic infection. [Fr., Gr.]