Hello, My son has developped a face and nexk rash. It s red,patchy and bumby in places. He s been playing outside quite a bit lately and mentioned that he s been in contact with the ground, grass. I have put on some Benadryl cream, seemed to be les visibal this morning, then applied sun screen SPF 15 but after picking him up after school, the rash was back and seemed worse. What to do?