Back Herpes simplex Afrikaans هربس Arabic هربس ARZ হাৰ্পিছ ছিম্প্লেক্স Assamese Herpes simple AST Dampa BEW Херпес Bulgarian Kayap BJN হার্পিস সিমপ্লেক্স Bengali/Bangla Herpes Breton
Herpes simplex is an infection by a virus. The herpes simplex virus (HSV) causes two common diseases. Both diseases have painful, watery blisters in the skin or mucous membranes (such as the mouth or lips) or on the genitals.
An infection on the lips is commonly known as a cold sore or fever blister. A cold sore is not the same as a canker sore, which appears inside the mouth and is caused by something else.