Chancroid
Pathogenesis

Haemophilus ducreyi enters skin through microabrasions incurred during sexual intercourse. The incubation period of the infection is 10 to 14 days, after which there is progression of the disease. A local tissue reaction leads to development of erythematous papule, which progresses to pustule in 4–7 days. It then undergoes central necrosis to ulcerate.
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