Final answer:
Chancroid is a sexually transmitted infection caused by Haemophilus ducreyi. It presents as deep, painful ulcers with ragged borders and inguinal lymphadenopathy. The infection can spread to the lymph nodes and release pus through the skin.
Step-by-step explanation:
Chancroid is a sexually transmitted infection caused by the gram-negative rod Haemophilus ducreyi. It is characterized by deep, painful ulcers with ragged borders, grey exudate, and inguinal lymphadenopathy. The infection can spread to the lymph nodes, leading to the release of pus through the skin.