Scabies and bed bugs are the same thing...You can't see them. They come out at night. They live in the fibers of the mattress they are tiny you won't see anything look for them.
I'm telling you for real we had the same exact things and they did NOT go away until we deep cleaned and literally changed up how clean the apartment was kept and used essential oils. You'll know if in another week the problem is even worse.
When college kids move out here there is tons of furniture set aside for the garbage sometimes brand new looking expensive stuff NO ONE touches why? Because most likely it's full of scabies (bed bugs they are the exact same)