"Body lice are tiny insects, about the size of a sesame seed. Body lice live in your clothing and bedding and travel to your skin several times a day to feed on blood. The most common sites for bites are around the neck, shoulders, armpits, waist and groin — places where clothing seams are most likely to touch skin.
Body lice are most common in crowded and unhygienic living conditions, such as refugee camps and shelters for the homeless. Body lice bites can spread certain types of diseases and can even cause epidemics. They can also spread from contact with an infected person's clothes."
~ From Google.
Could be fleas too. It could be probably quite a few different things. I'd suggest looking at images of different types of bites, google images would be a great place to start down that road. Then once you think you have a match, read about that type of bug. Again, google would be a great place to start. You might also want to re-familiarize yourself with what scabie bites look like. They're not all big noticeable bites from what I'm seeing on google images. If for whatever reason you think this is a better place than google to figure this out, I'd probably suggest a lot more details.