A burn injury is a type of injury that may be caused by heat, electricity, chemicals, radiation and even cold. The amount and level of damage burns cause can vary greatly. Tissue affected, the severity of the burn and the resultant complications. Depending on where the burn is located and how severe it is, a burn victim may experience complications including infection, shock, respiratory distress, scarring and deformity. It can also lead to severe emotional and psychological distress. Burns are classified by degree. First-degree burn injuries are usually limited to erythema or redness with minor pain and only involve the epidermis layer of the skin. Second-degree burn injury can include skin blisters and may involve the nervous system. Third degree burn injuries result in a severely damaged epidermis layer and the subcutaneous tissue underneath is also damaged. Third degree burns result in scarring and may require grafting. Treatment with an appropriate specialist such as a plastic surgeon for significant burns is important for proper healing.