It's scarring - probably from a rough rub or bad shed - it should go away with a few sheds.
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Tosha 
JET Pythons
(CJBianco explaining the origins of the BP market.)
"In the beginning Bob created the Ball Python market. And the market was without morph, and wild traits were upon the industry. And Bob said, Let there be morph, and there was morph. And Bob saw the morph, that it was good; and Bob divided the morph from the wild trait. And Bob called the morph Albino, and the wild trait Normal. And the Albino and the Heterozygous Albino were the first investment.
-- Christopher 1:1-1:5"