Merck Manual

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Syphilis—Primary: Chancre on the Genitals
Syphilis—Primary (Genital Chancre)
Syphilis—Primary: Chancre on the Genitals

During the first (primary) stage of syphilis, painless sores (chancres) may appear on or around the genitals.

Image courtesy of Drs. Gavin Hart and N. J. Flumara via the Public Health Image Library of the Centers for Disease Control and Prevention.

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Syphilis