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.
Yes, this will work exactly as per yoghurt remedy due to lactic acid content. Lactic acid, which makes it sour, appears to be the key. It's effective and fast!
