Your son's rash sounds like an allergic reaction called 'papular urticaria' due insect bites.Mosquito bites or sand flea bites are the most common cause. You can apply Phenergan cream to the pimples and this should relieve the swelling and itching.Also give your baby a safe antihistamine syrup such as Allecet syrup 2.5ml [half a teaspoonful] at night for as long as the rash is present.
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