First-degree. These burns only affect the outer layer of your skin, called the epidermis. A mild sunburn’s one example. Your skin may be red and painful, but you won’t have any blisters.

A first-degree burn may happen when you’re only out in the sun for a couple of hours, especially between the hours of 11 a.m. and 3 p.m., without sunscreen, and could happen anywhere.

Deep burns (second-degree over a large area, third-degree, or fourth-degree). Burns caused by chemicals or electricity. Signs of infection (increased pain, redness, swelling, or oozing).