A cold sore, also known as a fever blister, is a small blister that typically appears on or around the lips. They are caused by the herpes simplex virus (HSV-1), which is extremely common and highly contagious. Cold sores are usually red, swollen, and painful, and they can break open and form a crust or scab. They typically last for about a week or two and can be treated with over-the-counter creams and ointments.
Cold sores are often triggered by certain factors, such as stress, sun exposure, or a cold or flu. While there is no cure for the herpes simplex virus, there are ways to manage and reduce the frequency of outbreaks. Some people find that taking antiviral medications or using lip balms and lotions can help to prevent or shorten the duration of cold sores. Additionally, practicing good hygiene, such as avoiding close contact with people who have active cold sores and washing your hands regularly, can help to prevent the spread of the virus.
Signs and Symptoms of Cold Sore