Your son's bites are not due to bed bugs but more likely are due to sand flea bites. Children are often bitten by sand fleas when playing in sand or sand pits. The rash is called 'papular urticaria'. Read more about this on Google. There is an excellent New Zealand site for information so look out for it. Your son may now have developed an infection in these bite areas because of scratching and he may now have a condition called impetigo. From your description this is very likely especially with the rash being on his face as well.He should be seen by a doctor today.
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