Ball Python with Pink Belly?

[RR - Mackenzie]

I just got out my ball python to hold (he's around my shoulder ), and after checking his scales (they got a little damaged after he escaped, they should be better after he sheds), and after checking him out, I noticed his belly is pink! I've never seen this on him before, and I was wondering what could have caused this? He hasn't eaten since November, and I will be getting some ASFR this June at the Columbus reptile expo...

I was wondering why is his belly pink? What could have caused it?

* He's a normal ball python, three years old, and a little over 1,600 grams... we are not sure of his sex... but I call him a boy