Medically reviewed by Soma Mandal, MD Both herpes simplex viruses (HSV) can cause internal and external symptoms, like sores.

HSV-1 most commonly causes oral herpes, sometimes called cold sores or fever blisters, on your lips, mouth ... with a medical ...

Herpes labialis presents as a blister or cluster of small blisters that appear at the corner or edge of the lips which are painful and reddish purple in color.

Genital herpes is a common sexually transmitted viral infection often causing sores and blisters around the lips, genitals or anus ... First time infections may last two to four weeks while recurrent ...