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an oval to round, yellow-gray to white, membrane-covered lesion or lesions occurring on the mucous membranes; usually seen in secondary syphilis.
Farlex Partner Medical Dictionary © Farlex 2012
A syphilitic eruption having an eroded, moist surface; usually on the mucous membrane of the mouth or external genitals, or on a surface subject to moisture and heat.
See also: patch
Medical Dictionary, © 2009 Farlex and Partners