When I am out in the sun and after a day or two I get a red bumpy face and white heads. It looks like a rash but it is not itchy. I do use sunscreen. I wonder if it because I overheat. When I get really hot my face goes red..I always thought that this is how I cool down. People think I am going to passout, but I feel fine. Not sure what to do or what it could be.