Unseen Bugs Leaving Itchy Bites?

It all started when I worked at a hotel and my boyfriend and I would stay there sometimes. We never had any problems. Well one night we stayed there and in the morning woke up and had these itchy bites all over us. It looked just like bed bugs. So we checked the room we were in, but there was nothing; no bed bugs.

So we were living at my mom's house and moved out, but we still stay there about once a week. Well then for about two months straight my boyfriend kept waking up there with those same itchy bites all over his body. I would never have them though. And my mom has never had any problem with any of it. So after about the two months I started getting the bites all over too. Now every time we stay there we both wake up with bites all over. I don't see how it could be bed bugs because I haven't found them, my mom doesn't have bites or find bugs, and we sleep in the living room so if that was the case the whole house should be infested.

I have searched everything and just don't know what it could be. But these bites are so itchy and so random. I would think it was some sort of reaction, but you can see a little puncture mark where we were bit or stung or whatever. How could he only be getting them then randomly I start too?Please help! Also we live in Colorado.