The herpes simplex virus (HSV) causes blisters and sores around the mouth, nose, genitals, and buttocks, but they may occur almost anywhere on the skin.

HSV infections can be very annoying because they may reappear periodically. The sores may be painful and unsightly. For chronically ill people and newborn babies, the viral infection can be serious, but rarely fatal. There are two types of HSV - Type 1 and Type 2.

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