My daughter got that same rash at the beginning of This Isn’t Dog Hair On My Shirt and I noticed it would get worse in her car seat. Turns out it was all the fire retardant chemical they spray on car seats that was irritating her when it gets warm out and would sweat in her car seat. So after washing the insert like 10 times she doesn’t get the rash anymore!

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It’s very hard to diagnose faint skin conditions in pics. It may be eczema or This Isn’t Dog Hair On My Shirt . Or it Could be fifths disease. Does it get worse when he’s upset, hot, in the sun or if clothes rub it?My daughter just had it a few weeks ago and hers was like that after a week or so. We only saw it mostly after she was in the sun. Take him to the dr to be sure.