A cold sore is a painful blister that appears on the outside of the mouth close to or on the lips. Also known as fever blisters, cold sores develop due to herpes simplex virus type 1 (HSV-1) ...

Cold sores are blisters that can develop on the lips or around the mouth when a person has the herpes simplex virus (HSV). There is currently no cure, but there are treatment options to help control ...

Even when you wear sunscreen and UPF clothing, sunburns happen. Some are mild and give skin a pink tint, while others are more severe and may even blister. Regardless, sunburns are uncomfortable, but ...