First degree burns- burns that injure the first and second layer of skin

Fourth degree burns- extend through the skin to injure muscle, ligaments, tendons, nerves, blood vessels, and bones. These burns always require medical treatment

There are two types of Second degree burns-

Superficial partial - thickness burns, injure the first and second layers of skin.

Deep partial - thickness burns, injure deeper skin layers

Third degree burns- ( full- thickness burns) injure all the skin layers and tissue under the skin. These burns always require medical attention