The repair of tissues after a burn, an injury or an operation requires the body to "work overtime", not only to regenerate the tissue itself but also to get rid of the so called "free radicals". No, those aren't members of a terrorist organisation, but they well could be, because they wreak havoc in the affected tissues.

Antioxidants like vitamin C and E assist the body in tackling these free radicals and regenerating tissues.
For optimal results, take about two and a half times as much vitamin C as vitamin E until your wound has healed.

To assist wound healing externally, you can also cut open a vitamin E gel capsule and put the oily substance directly onto the cleansed wound, scab, or sunburn. On burns, use it after cooling properly, and do use common sense: For large or serious burns, go straight to the hospital without delay.