What are blisters?

What are blisters?

Your skin consists of three layers: the epidermis, the dermis and subcutaneous (below the skin) fat. A blister forms under the epidermis as a fluid-filled sac. Typically, it may be filled with clear liquid or blood, depending on the injury that damaged your skin.

Blisters may be painful or itchy. If a blister gets infected, it will fill with milky-white pus. Blisters most often show up on the feet or hands, but they can appear anywhere on the body.