Hello, I'm Dr. Clark and I'm happy that you have asked me to assist you with your child and hope that you can benefit from my many years of helping parents like you.
I suspect you just have chigger bites, which are very common in the summer. These insects are microscopic so you cannot see them and they don't cause any pain or itching when they bite you. They characteristically don't itch for at least 1-2 days and that is when you notice them. These are harmless, don't lead to any other infections or illnesses and will go away on their own. Benadryl by mouth or topically will help with the itching.
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I see you have not reviewed my reply so I'll switch us to the Q&A mode since chat is to be used if both of us are online and able to chat. I'll watch for your return to our conversation and am happy to assist you.