What kind of bite is this?

I have had a couple bites within the last week, and they are super itchy and almost firm/hard around the bites/bumps. I went to the dr and he told me he wasn’t sure but it could be flea bites. Does anybody know what could cause this? Also haven’t shaved in a little so my legs are a bit hairy.

The first picture is the first one I got about a week ago.

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