Hello XXXXX,

Thanks for posting on XXXXXXX

If the rashes came after taking the shots, it means your son is either having an allergy or suffering from a side effect. In either case, he would probably need antihistamine medication such as chlopheniramine or other brands and/or steroid antiinflammatory such as prednisone to handle the rashes.
I suggest you see a primary care doctor as soon as possible for complete evaluation.

hope this helps and let me know if you have any further questions.
Dr. Nsah

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