Stop rubbing oil on your snake.
Buy Provent a Mite. http://pro-products.com/provent-a-mite/
A few mites can easily turn into an infestation. Provent a mite is the best way to get rid of them for good.
Sometimes they take over a month to poop out a meal. Don't worry about it unless his butt looks swollen and firm. Then maybe a warm soak to help him along.
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