Blister is a collection of fluid below or between the surface layers of skin. Blisters are commonly the result of burns or continuous rubbing of the skin. However, they can also be caused by allergic reactions and certain diseases. Blisters that result from a sharp pinching of the skin can fill with blood.
The skin that covers a blister protects the tissues underneath from infection and further damage. Whenever possible, this skin should not be opened. When a blister is opened accidentally, it should be cared for like an open wound. Cleanse the area with soap and water, apply an antiseptic, and keep the wound clean with a bandage. If signs of infection appear, consult a physician.
