A blister is a characteristic finding of a second-degree burn. Second-degree burns involve the epidermis and part of the dermis layer of skin, and the burn site appears red, blistered, and may be swollen and painful. It is important to avoid popping or damaging a burn blister, as it is the bodys way of protecting the underlying burnt skin while it heals. Instead, people should try to leave the blister intact until the burn underneath heals. For minor burns, people can use basic first aid to help ease pain and reduce complications from burning, which may prevent a large blister from forming.