Cold sores are small sores, or blister-like lesions, that appear on the lips, chin, cheeks, inside the nostrils, and less frequently on the gums or the roof of the mouth. They usually cause pain, a burning sensation, or itching before they burst and crust over. They are often called fever blisters. The most common cause of cold sores is the herpes simplex type 1 (HSV-1), but sometimes the herpes simplex type 2 (HSV-2) can cause it. Symptoms can include: lesions, blisters, or ulcers on the tongue or mouth mouth or tongue pain lip swelling possible swallowing difficulties sore throat swollen glands high body temperature dehydration nausea headaches Treatment Most cold sore outbreaks clear up within 1 to 2 weeks without treatment. Some ointments and antiviral medications may shorten the outbreak s duration and alleviate discomfort and pain. I hope you happy with information . kindly rate it thank you.