I'm itchy and I recently discovered tiny mites on my hamster... but they don't appear to be related. Other causes?

So last week I got a really itchy spot on my leg… to the point where I couldn’t stop scratching and eventually scratched it raw, and now it’s scabbed over. But it still kind of itches.

I’ve also gotten a spot on the inside of my right breast, part of my upper arm, my waist right by the pants line and a little below, in the crook of my right elbow, and now the latest itchy spot is behind my right knee.

Now, on Friday, we discovered that our poor hamster Madmartigan was infested with tiny reddish mites. Not ticks or fleas, at least. We put him in his ball, cleaned the cage out, threw out all the bedding and food we had, wiped it down with cage wipes, rinsed it out with boiling water, wiped it again with cage wipes… did the same with the lid after we discovered some were hiding in there… new, clean bedding, all new food, and even bathed him in warm water in the bathroom sink and then proceeded to pick every visible bug out of his long hair with our fingers. We even took our clothes off immediately after and washed them in hot water. Ever since then, he’s been his old self again, and while we’ve found one mite here, one there in his cage, they seem to be gone.

Now of course you’d think that these mites are the cause of my itchiness, right? How? Because both of my cats and my boyfriend are fine, and we haven’t seen them anywhere else. If they were on me, then they’d also be on the furniture and in the bed, right? And if they were in those places, then my boyfriend and my cats would be affected… and he’s fine, and not only do they appear fine, but we haven’t seen any bugs on them. And, I haven’t seen any bugs on myself.

I’ve been using the same detergent and fabric softener and dryer sheets, I’m not wearing new clothing… I got a new body wash but I haven’t used it for at least 3 showers now (and I shower minimum once a day) and new itchy spots keep cropping up.

They’re so itchy it’s literally impossible to not scratch, and 3 of them have that rashy look to them from all the scratching.

What could it POSSIBLY be? I’m out of ideas.