At first I thought it might be stuck shed, but I'm not sure. Humidity is usually on the lower side (around 40), since he had been on reptile carpet before we JUST switched over to bioactive. Carpet was because a few years back he had an issue with stuck shed on his eye and the vet gave us an ointment and said to get rid of the aspen while treating, and we just hadn't gotten back to something else till now. He ate his last meal just fine and appears to be his regular self. Thanks!!