As soon as the burn occurs, apply vinegar. Do not rub, just dab. Do not apply thick salves, butter, or ointment, as this will only trap the heat in. Onion juice works as well as dabbing cold milk, especially useful if it is a chemical burn(milk)
Once the "heat" has gone out of the burn, aloe vera gel may be applied, to promote healing.
Aloe is very useful for sunburns as well.aloe vera gel can be purchased any where, make sure its 100% pure