question: hello, My son started about a year ago getting this redness on the backs of his hands and the tops of his feet with some welts. I have sone all the questions like what he touched ate drank if it was after a shower etc. Nothing It just appears and spreads and will be there for about a hour or so and will go away He is 15 and has autism. this has been going on for a couple of years One time it was all over his back and stomach I took pictures It seems kind of pointless to take him to the doctor when I walk in with a kid with no rash can you advise