primary syphilis:

Syphilis develops in threre stages; in stage one or primary syphilis , a small, painless (75% of the time), red or pink sore (known as a chancre) may appear at the spot (around or in the vagina , on the penis , or inside the mouth or anus) where the germ first entered the body, usually from 9 to 90 days after infection; the sore may disappear if not treated, but the germ remains in the body

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