Definition: The characteristic sore caused by a syphilis infection. Usually round, firm, and painless.
Also Known As: genital ulcer
By Elizabeth Boskey, Ph.D., About.com Guide
Updated August 06, 2007
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
Elizabeth Boskey, Ph.D.
Sexually Transmitted Diseases (STDs) Guide
©2013 About.com. All rights reserved.