the bare butt is because s/he was flicking hairs off of the rear (defense mechanism) which is normal, especially since it sounds like they were in a bad situation...it looks like a mexican red leg (b. emilia) which is one of the t's i have...
mine likes to flick hairs occasionally and that's what her butt currently looks like... there's nothing wrong, just needs a better environment and a chance to molt.
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