A patch is a flat area of color change in the skin that is 0.39 inches (in) or 1 centimeter (cm) or more wide. It is a type of skin lesion.
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Review Date 7/23/2024
Updated by: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.