You do not mention your son's age.This is probably an allergy to sand flea bites called papular urticaria. Give your child a dose of Thiamine Hydrochloride [vitamin B1] 25mg daily for 3 months [this will probably be a quarter of a 100mg tablet which you will need to give him once daily]. This will make him less likely to be bitten by fleas. Give him the Allergex at night and apply calamine lotion to the flea bites twice a day.
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