What does this look like?

So I’m at my mother in laws house this morning celebrating Mother’s Day and my two year old son is playing, running around with his cousins and I notice his shorts ride up and bumps on him so I call him over and I was horrified with what I saw. My MIL lives in an older house with old, old carpet from when it was built so I assumed it was possibly flea bites but I took him to get checked out and the PA said it looks like bed bugs.. I came home and instantly checked his bed and nothing. I just moved into a brand new, just built house so I was like BED BUGS what? Has anyone experienced bed bugs and do these look like the type of bites? Thank you in advance. I’m just caught off guard and feel so bad for my little man.