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Hi. This is very common this time of year and is due to a viral infection which is why it really isn't bothering him.
If he is uncomfortable or itching you can give him Benadryl but otherwise I wouldn't worry at all and he's not contagious.
The rash is always brought out by heat so a bath, the sun and sleeping bundled up will always make it show up but again, it is not harmful at all.
Yes (see above).
This is a rash due to blood flowing to the skin and the warmer he is the more it shows up.
It is quite common and as with most viral infections the rash is the end of the illness even though he didn't really have any other symptoms before or now.
He may have it off and on for another 3-4 days but is not contagious.
This time of year we see lots of viral rashes, including roseola, hand-foot and mouth disease, etc.
That won't happen as he would already be itching terribly and perhaps wheezing if it were allergic.
Sure, but it will be gone soon and you need not worry.
You are quite welcome. Have a nice weekend.
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