I don't like to advertise any, but you should look into some healing salve from "healin hollers" I've used it for cuts, bruises, a couple of mild burns and always had pretty good results as far as relief. However I've never tried it for razor burn.
It's all herbal based if that's any kind of concern for ya, and they print right on the label what alls in it. In fact if your of the make-it-yourself variety you could probably look up a similar recipe and make some yourself.