A cold sore on this patient’s lip was caused by the herpes simplex virus type 1 (HSV-1).
Credit: cdc.gov
View full size image
Herpes, a very common viral infection, spreads by person-to-person contact.
The infection is caused by the herpes simplex virus (HSV), which comes in two forms: HSV-1, which usually results in oral herpes infections affecting the mouth and lips; and HSV-2, which...
