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A chancre ( SHANG-kər) is a painless genital ulcer most commonly formed during the primary stage of syphilis. This infectious lesion forms approximately 21 days after the initial exposure to Treponema pallidum, the gram-negative spirochaete bacterium causing syphilis. Chancres transmit syphilis through direct physical contact. These ulcers usually form on or around the anus, mouth, penis and vulva. Chancres may diminish between four and eight weeks without the application of medication.
Chancres are also associated with the African trypanosomiasis (sleeping sickness), surrounding the area of the tsetse fly bite.