Advertisement Finally got a better look at the bald spot on my new rescue T. When I was trying not to mess with him it just looked like dark skin beneath the hairs. Now I can see the skin is still light, but there is a disturbing dark patch. Is this an injury of some kind? I know crickets when left in with an animal can start to do damage--the pet store left this guy with around 60 roaches in his little tank, so I wonder--is this a problem from roaches biting? I've never had a tarantula before, so I can't tell what's going on here.