Unfortunately there isn’t a cure for cold sores. Cold sores are caused by the herpes simplex virus which attacks the nerves in your body. The virus lies dominant in your body and certain factors like stress, sun exposure and tiredness can bring an attack on. Normally you can tell if an attack of cold sores are coming because the area around the lips tingle. They generally clear up themselves but if there is a prolonged attack then doctors will prescribe oral tablets to speed up recovery. To prevent attacks try to take a supplement of vitamin c and rest and eat proper meals.