Aug 11, 2025 · Cold sores are painful blisters caused by an infection with the herpes simplex virus (HSV). Learn more about the causes, risk factors, symptoms, treatment, complications, and …

Jan 5, 2024 · Cold sores are sometimes called fever blisters. Cold sores, or fever blisters, are a common viral infection. They are tiny, fluid-filled blisters on and around the lips. These blisters …

Cold sores are small blisters around the mouth, caused by the herpes simplex virus. They are sometimes called fever blisters.

What is a cold sore? A cold sore (also called a fever blister) is a skin blister associated with a herpes simplex virus (HSV) infection. Cold sores typically form on your lips or the skin around …

Dec 18, 2025 · Cold sores are caused by the herpes simplex virus (HSV). HSV is spread through contact with infected saliva or skin. After the initial infection, HSV tends to stay inside your …

May 29, 2025 · Cold sores usually occur outside the mouth, on or around the lips. When they are inside the mouth, they are usually on the gums or the roof of the mouth. They are not the …

How do dermatologists diagnose cold sores? Your dermatologist can often tell if you have a cold sore by looking at it. Your dermatologist may also dab a swab, called a culture swab, onto a …

Find out about cold sores, including what the symptoms are, when to get medical help and how to treat them.

Cold sores are small, painful, fluid-filled blisters or sores that appear on the lips, mouth, or nose that are caused by a virus. The sores can be painful and usually last a few days.

Dec 18, 2025 · Cold sores, also known as fever blisters, are small, painful blisters that typically appear on or around the lips. They are caused by the herpes simplex virus (HSV), primarily …