Cold sores (canker sores) are small, painful, fluid-filled blisters or sores that appear on the lips, mouth or nose. They are caused by a virus. The sores can be painful and usually last a few days. Cold sores can often recur.
Cold sores are small, painful, fluid-filled blisters or sores that appear on the lips, mouth or nose that are caused by a virus.
Cold sores are caused by a virus called the herpes simplex virus (HSV). There are two types of HSV. Learn more about the causes...
Treatments for cold sores include paying extra attention to personal hygiene, over-the-counter (OTC) medication for symptomatic relief, natural remedies and prescription-strength medication. Learn more about treatments...