feet turning black? how did things get so bad?
Well, if you have a pair of scissors with a very tiny blade, like cuticle scissors, you could try to cut through the dead skin around the wrists so it isnt constricting like a rubber band. But you'd have to be verrrry careful not to cut delicate gecko skin instead, and sterilize the scissors blades first. Then I'd try putting Neosporin all over the feet and letting that soak in for a while, then try the gently rubbing off again.
Once you get the skin off, your work isn't done. Put Neosporin on those feet every day, maybe twice a day, until they are completely healed.