full thickness burn
full thick·ness burn
/fo͝ol ˈTHiknəs bərn/
Noun
A burn that consumes all layers of the skin. When the skin either takes on a dry, white appearance and appears thick and leather like or turns black looks charred, it is a third degree burn. When a full thickness burn involves the subcutaneous layer, muscle tissue, bones and organs, it is a fourth degree burn.