Tissue damage from minor burns can result from many causes. Causes may include the sun, radiation, chemical, electrical, or heat. Burns are categorized according to the depth of the burn.
First-degree burns affect only the outer layer of skin (epidermis), causing redness and pain.
Second-degree burns affect the outer layer and the second layer of skin (dermis). These burns may blister and swell. They are painful and may leave scars.
Third-degree burns damage all layers of the skin and may reach fat or even bone beneath the skin layers. These are serious burns that require additional care to prevent infection and promote healing.