Final answer:
A full-thickness burn appears white or charred and is typically painless due to nerve endings being destroyed. It requires significant medical treatment including possible skin grafts or surgery, as it destroys both epidermis and dermis layers of the skin.
Step-by-step explanation:
A full-thickness burn, which may be referred to as a third-degree burn or higher, typically looks white or charred, and because the burn extends through the entire epidermis and dermis, destroying the tissue and affecting the nerve endings, it often results in no pain.
Full-thickness burns cannot be repaired by the body alone and require medical attention. The damaged areas typically need treatments like excision (debridement), amputation in severe cases, and skin grafting either from an unaffected part of the body or from skin grown in tissue culture. These burns are serious injuries that can be life-threatening without proper medical care.