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This is Dr. David
these could be beg bug bits
or fea bites from animals in the home.
you you have to strip your mattress sheets to check for bed bugs in your mattress which could be biting you at night time
do you have animals which come in and out of the house? they have to be check for fleas.
in rare cases, scabies skin infection can cause this as well
skin scrapings at the sites can check for scabies skin infection.
let me know if you have questions.