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Genital Sore

A Genital Sore
A Genital Sore

Several sexually transmitted diseases, such as chancroid, can cause painful blisters on the penis. The blisters rapidly rupture to form shallow, open sores with ragged edges. This photo shows a sore (called an ulcer) that formed after a blister opened by itself.

Image courtesy of Dr. Pirozzi via the Public Health Image Library of the Centers for Disease Control and Prevention.