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Does he have a fever? If so, since when?
Has he come in contact with anything that could have given him an allergy - gone swimming or hiking etc?
Please post the pictures.
Please wait while I review the images.
Also, does he have a fever?
This is a heat rash - also called prickly heat or miliaria . Heat rash develops when blocked pores (sweat ducts) trap perspiration under the skin causing the formation of small or big reddish itchy rash.
Please apply a cold pack over the skin. Then apply a 1% hydrocortisone over the rash - this will decrease the inflammation and reduce itching.
Dust Caldacene powder to keep the skin dry and protected.