my 7-yr old grandson has a rash that is spreading over his shoulders, upper chest, arms, somewhat on his belly, spreading down his legs, and now its getting onto his hands. it is red and a little pustule-looking, though mostly flat. He says it doesn t itch too badly. At first I thought it was sunburn, but then I realized he had been wearing a rash guard. Then I thought it might be contact dermatitis from his swimwear, but obviously that isn t it, as it is spreading onto his hands.