What you describe sounds like papular urticaria (itchy red bumps). This is caused by an allergic reaction to a whole host of insect bites and it is nearly impossible to eliminate the cause. Most children grow out of it and the treatment is usually only symptomatic. If there is a specific insect, like a mosquito, that is the most likely candidate one can take precautions to avoid being bitten. Luckily the application of a MILD steroid cream to these itchy spots do give symptomatic relief and the side-effects, if used only when needed on the body and not the face, are really negligible.
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