1st degree
Burns classification according to the depth and surface fo the burn
We consider 3 degrees :
1st DEGREE BURNS
Only the skin is affected. The skin is red, dry, sometimes slightly swollen and painful because of irritation of nerves’ endings. It is sunburn. ...
The wound will heal spontaneously within a few days without leaving a scar. The risk of infection is minimal.
2nd degree
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2nd DEGREE BURNS It is necessary to differentiate two possibilities:
Subject to effective monitoring and good evolution, this 2nd degree burns can heal in about a fortnight.
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3rd degree
3rd DEGREE BURNS

All the skin is burned. These burns are painless, because the nerves endings are destroyed. The wound is white, yellow, and brown. A 3rd degree burn goes usually with a 1st and 2nd degree. Spontaneous healing is impossible.

On the one hand, a superficial burn of the 2nd degree where the epidermis and part of the dermis are damaged. The pressure of the plasma leads to blistering; the wound is red and moist. These injuries are very painful given the irritation of the nerve endings.
On the other hand, the second degree deep burn where the epidermis and a large part of the dermis are damaged. The appearance of the skin is either drab or bright white. The sensation of pain is attenuated because of nerves endings damage.