The best first aid for burns is diluted vinegar. Vinegar is luckily available nearly in all households. Cover the injured area with a cloth, soaked in diluted vinegar of any kind. Vinegar acts painkilling and relaxing. If pains become stronger again, change the compress for a fresh one. Refresh the vinegar compress as often as needed.
Another good first aid for burns is Lavender essential oil. Immediately put some neat Lavender oil onto the burned skin area. Lavender is not only a very effective antiseptic, but is also painkilling, helps to reduce the pain of the burn and promotes rapid healing. It will reduce eventual scaring. Lavender, applied to a burn very quickly, will often heal it with no scarring at all. For larger burns, Lavender oil should be poured neat onto a gauze or cloth, and applied to the burn, and renewed every few hours.
It is a good idea to grow an Aloe vera plant in a sunny kitchen window. For a burn first aid, slice off a small piece of the fleshy leaf, open it, and apply the fresh sap directly on the skin burn. Aloe vera has astringent and tissue-healing properties works fabulous for skin burns.
If the burn is severe then always consult a doctor. Running the area affected under cold water for a few minutes where appropriate before applying the treatment is advised.