The issue with the skin look to me like dried shed plus dirt/poop stuck to it (keep in mind I have not seen the animal in person). Sadly when you have anything like albinos it's hard to keep them clean, and stuck shed is not a big issue a warm damp towel will do the trick, simply let it slither through it or rub those spots off gently.
As far as feces it can be wood mites, it can be larva from gnats or fruit flies as well if you have some or it can be something else, having a fecal does not hurt, if you still have the feces put them in the fridge and bring them to your vet and have a fecal done.
With new addition I would highly recommend to do a preventive treatment for mites regardless just because all it takes his 1. Provent a mite will be you best choice and will take care of mites and eggs.
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