There are many types of burns caused by thermal, radiation, chemical, or electrical contact. Hot metals, scalding liquids, steam, and flames, when coming in contact with the skin, can cause thermal burns. Burns are classified as first, second, or third degree depending on how deep and severe they penetrate the skin's surface. First degree - affects only the epidermis layer of skin. The burn site appears red, painful, dry, and absent of blisters.
Mild sunburn is an example.
Second degree - involves the epidermis layer and part of the dermis layer of skin. The burn site appears red, blistered, and painful, with possible swelling. Third degree - destroys the epidermis and dermis. Third degree burns may also damage the underlying bones, muscles, and tendons. The burn site appears white or charred black.