Cold Sores (Fever Blisters)
A viral infection usually causes cold sores (fever blisters), which are contagious. Cold sores are tiny, painful, fluid-filled blisters.
Type 1 of the herpes simplex virus (HSV-1) causes cold sores, also called oral herpes. Type 2 of the herpes simplex virus (HSV-2) affects the genital region. HSV-1 can also spread from the mouth to the genitals.12
Cold sores often appear in clusters on or around the lips. You may experience a tingling sensation in the affected area before a breakout.13
Treatment Options
There’s no cure for cold sores, and they often go away after a few weeks without treatment. Antiviral medications can speed recovery.14 A healthcare provider may also advise antiviral medications to prevent cold sores if you have frequent outbreaks.15
