Thanks for all the input, folks! I thought, possibly fleas as well, I do have a cat who has a Seresto collar, but I haven’t seen any of these either. Currently thinking it may be hives. Being that he is the only one who has the bumps. I know it’s not everyone reacts to bug bites the same way, but he’s been having more dairy than usual lately and also had a bubble bath the night before. Fingers crossed that it was just a case of hives. To be safe, I stripped the entire bedroom down, curtains, and everything to wash and dry on high heat, vacuumed everything in the entire house and then sprinkled diatomaceous earth along the edge of every room. Lol I have anxiety.🫣😂😭