
Be very careful if it comes out in your mouth, you are infected
Cold sores, or fever blisters, are caused mainly by the herpes simplex virus type 1 (HSV-1), though HSV-2 can also be responsible. They are highly contagious and spread through direct contact (kissing, sharing utensils) or indirectly via contaminated items. Symptoms begin with tingling or itching, followed by fluid-filled blisters, which rupture and then scab over. Outbreaks typically last 7–10…