What keeps biting me

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: A couple months ago i had two small clusters of bites on my back that itched like crazy and took forever to go away. About two weeks later both feet and ankles had multiple bites on them. since then i speradically get a few or just one on my ankles, feet, knees, or wrist. my bf and infant never get bites and my daughter one time in the beginning had six on her chest but non since then. Some of my bites itch, some of them dont. some are raised some or just flat. once in a while i get one thats painful. they are tiny red dots. : What is biting me?!?!?!

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