Black poppy seed looking things are reptile mites. Even if you don't see them, they could still be around. Eggs are microscopic and juvies are almost near invisible.

Sanitize your cage, cage items,and accessories with bleach and hot water. Put your snake on paper towel substrate and keep the set up simple ( hide and water dish)

Provent-a-Mite works wonders. And it should be a standard procedure to treat all new additions for mites, so its great to have PAM on hand.

In the mean time, soak your snake once a day for 15-30 minutes with a drop or two of dish soap.

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