What is chancroid?

Chancroid is a sexually transmitted infection (STI) caused by the small fastidious gram-negative bacterium Haemophilus ducreyi (H. ducreyi). It is characterised by painful genital ulcers and painful swollen lymph glands in the inguinal area. Chancroid is different from the non-sexually transmitted skin ulcer disease also caused by H. ducreyi reported in children and young adults in the South Pacific islands.

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Source: dermnetnz.org