How do you treat red sunburn?

Aloe Vera & Aspirin. Use cool aloe vera gel multiple time an hour and take Aspirin or advil (ibuprofen) in recommended dosage until the burning goes away. As the sunburn continues to heal and peel, switch to a moisturizer such as dml lotion made by person covery.
Moisturizers and ? Keeping the skin moist and protected is important. The use of nsaids to reduce inflammation and potential damage as well as antioxidants are a bit more controversial.