If you mean that little yellowish thing in the middle of the photo, that appears to be one of two spurs on his ball python...one on either side of his cloaca.
It's totally normal...not all snakes have spurs (they are the vestigial remains of having evolved from lizards...you're looking at what's left of his thigh bone), but
of those that do, they are typically more prominent on the males, & in fact when mating the male snakes actually use their spurs to actively to stroke the female
in an effort to gain her cooperation in mating. In some snakes, both males & females have spurs, so it's not a reliable way to identify the gender. Rosy boas have
them too, incidentally.
If you run to the vet with this question, he'll have a good laugh...& at your expense.
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