what is a chancre
A chancre (/ËÊaeÅkÉr/ ËÊÃ¦ÅKÉR-shang) kÉr is a painless (ulceration) sore most commonly formed during the primary stage of. syphilisifferences between the conditions chancre and chancroid 1  : Chancre is a lesion typical of infection with the bacterium that causes syphilis, Treponema pallidum. 2  Chancroid is a lesion typical of infection with the bacterium Haemophilus ducreyi. 3  Chancres are typically painless, whereas chancroid are typically painful.