Mysterious bug biting me once a day itchy

I have been getting these bites once a day the past three days and have looked and cleaned everywhere couldn’t find any bugs or traces of bugs anywhere. Even almost felt the bite(?) or bump come out of nowhere and didn’t see any bugs when I felt it.

So maybe it’s not even a bug?

This is an old one- two are near my stomach and one is on the back of my thigh near my butt. I don’t think it is a flea or spider I have seriously searched everywhere and haven’t seen any

So this is apparently what it looks like when its old and these are the new ones