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 Marshall MD - Family Medicine Adam Husney MD - Family Medicine Martin J. Gabica MD - Family Medicine Kevin C. Kiley MD - Obstetrics and Gynecology
Medical Review:Sarah Marshall MD - Family Medicine & Adam Husney MD - Family Medicine & Martin J. Gabica MD - Family Medicine & Kevin C. Kiley MD - Obstetrics and Gynecology