are cold sores symptoms of herpes?
Cold Sores-Symptoms. Cold sores are blisters on the lips and the edge of the mouth that are caused by an infection with the herpes simplex virus (HSV) . Cold sore blisters usually break open, weep clear fluid, and then crust over and disappear after a few days. Other symptoms may include: 1  A sore mouth that makes eating, drinking, and sleeping uncomfortable. 2  Cold sores can be painful. 3  A fever. 4  A sore throat. 5  Swollen lymph nodes in the neck. 6  Drooling, in small children.