Simply grind up some plain oats in a food processor and add them to the bathtub. Mix in the oats with cool water and soak your skin for around 15-20 minutes. The oats will help your skin retain its natural moisture.
Gently pat your skin dry instead of rubbing, as this can irritate your burns.
Aloe Vera
Aloe Vera is a very popular method for cooling sunburnt skin, and you can buy this from many supermarkets and chemists.
Aloe Vera, a succulent plant, houses a special gel inside its leaves and this gel has been used for centuries as an ailment to help skin damage, among a number of other things.
If you have an Aloe Vera plant at home, you can break off a chunk of it and apply the gel directly to your skin for immediate relief.