Cold sores result from activation of the herpes simplex virus. They appear as red, fluid-filled blisters around your mouth and other areas of your face.

Cold sores and mouth ulcers are often mixed up, but they are very different conditions and need different treatments. Cold sores usually appear on or around the lips and are caused by a virus.

Find out the causes, symptoms, and treatment options for cold sores inside the mouth, including tips for prevention and relief.

A cold sore (also called a fever blister) is a contagious blister associated with herpes simplex virus (HSV). Cold sores form on your lips or around your mouth.

Fever blisters are very contagious. Canker Sores are painful white or yellow sores that only form inside the mouth, usually on the insides of the cheeks or lips or on the tongue. Canker sores (also called …

Cold sores are blister-like spots that appear in or around the mouth. Find out about prevention, common triggers, treatment and self-care options.

A cold sore is a blister on the lip or around the mouth. Read trusted, assured NHS Scotland advice on symptoms, causes and treatments.