★★★★★
For a bad sunburn, I have always used plain sour cream by applying it generously over the affected area. It needs to remain on skin for 1-2 hours and then be washed off with just water. This does an excellent job of soothing away the redness and burning sensation. For a really bad burn, you can reapply every hour or so throughout the day. Truly the best thing I have found to work for me.
