What he said and also remember mites in their early forms of life aren't visible so i wouldn't rule that out yet however the juvenile mites usually don't move around to much yet so with that in mind don't rule out mites , but also it can be they are about to shed, low humidity , or she is trying to regulate her temps, ball pythons rarely soak unless something is wrong but also I do know of one that is perfectly healthy with perfect husbandry that soaks a lot , but its rare