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Herpes simplex virus type 1 symptoms (cold sores)

Location of cold sores near mouth, with close-up of blisters

Herpes simplex virus type 1 (HSV-1) can cause groups of small blisters that usually appear on the lip and around or inside the mouth. The groups of blisters are commonly called cold sores. They may be itchy or painful.

Current as of: February 26, 2020

Author: Healthwise Staff
Medical Review: Sarah A. Marshall, MD - Family Medicine
Adam Husney, MD - Family Medicine
Martin J. Gabica, MD - Family Medicine
Kevin C. Kiley, MD - Obstetrics and Gynecology

Research Health Topics

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