Cold sores

Cold sores, also known as fever blisters, are small, fluid-filled blisters that typically appear on or around the lips. They are caused by the herpes simplex virus (HSV), most commonly HSV-1. The initial infection may cause painful sores in and around the mouth, but subsequent outbreaks are usually milder. Cold sores are highly contagious and can spread through close personal contact, such as kissing or sharing utensils. Symptoms include tingling or itching around the lips, followed by the appearance of blisters that eventually burst and form a crust. While there is no cure, antiviral medications can help reduce the severity and frequency of outbreaks.