Burns can occur due to elevated temperature, chemicals, ionizing radiation and electric current. There are four active degrees of burn:
A burning of light first degree has such signs of swelling and redness that disappears after five days; The second degree of burns — the formation of blisters and bubbles on the skin of them, pass in ten days; the third degree of burns — the formation of a dense deep scar; The fourth degree of burns is the carbonization of skin tissues, which can reach the muscles and bones.