These are three classifications of burns - Hi friends, there are 3 classification of burn 1. A first degree burn causes redness and swelling in the outermost layers of the skin. 2. A second degree burn involves redness, swelling, and blistering. The damage may extend to deeper layers of the skin 3. A third degree burn destroys the entire depth of the skin. It can also damage fat, muscle, organs, or bone beneath the skin. Significant scarring is common, and death can occur in the most severe cases.