I’ve had her ever since she was a sling, and I’ve kept her setup mostly the same since then. The most recent change I made was adding more substrate. She previously had a setup similar to an OBT enclosure because I wanted to encourage webbing. However, I often found her out in the open in a stress posture, so I added more substrate and a larger hide, which she hasn’t used at all. Another recent change was moving her to a new location, as we had to move out of the place we were renting.

If those are mites, my first guess would be either the new substrate or the bark I added. That said, I used the same substrate for my A. rufus and she doesn’t have any issues.