What are cold sores?
People with cold sores have a painful ulcer on the lips or skin surrounding the mouth. Cold sores are caused by an infection with a herpes virus. About 90 percent of the population has been exposed to the herpes virus that causes cold sores.

What are the symptoms of cold sores?
Symptoms of cold sores include painful, blistery bumps and ulcers that on the lips and the skin around the mouth. Rarely, cold sores can occur inside the nose.

How does the doctor treat cold sores?
A cold sore usually will heal without treatment within 2 weeks. Treatment for severe or recurrent cold sores includes the use of oral antiviral medications, such as topical ointments and oral medications.