My corn snake is about 16 inches and when I look at his underbelly I can see these blue regions that I'm assuming are the organs inside. He has 3 that I can see, and there's one that's located near the cloaca that swells and expands when he needs to go pee, then it deflates after he's relieved himself.
I was looking at another snake (not sure what kind) and it didn't have these kind of spots.
I'm wondering if this is normal, or if corn snake's skin is suppose to look like it could be see-through?

Some snakes - depending on the morph (and corns have many!) then yes...you can see internal organs. What morph is your snake? The less pigment there is in the skin the easier it is to see through it. Can you get a picture?

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Veronica
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Exotic Animal Rescue of Henry Co.
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With hatchlings, particularly the lighter colors, you can see the organs.
Watching the lungs and heart work was always fun.
Till they got too big to do it anymore!

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Merlin,
What's Life Without A Little Magic!

Unfortunately I can't get a picture right now because I just lost my camera (booo...) and he's an amelanistic (I'm pretty sure) corn. It's just kind of wierd 'cause I'll look at him one day and see a blue spot that I thought I never noticed before, and I can't keep track of them as he never stops moving.

Another thing: I just fed him (almost 3 hours ago) and he's already moving around the cage again, and I can't seem to see a very prominent lump in his body. The pinkie was about the size of his body, so maybe it wouldn't show in his stomach, but how fast can they get it from their neck to their stomachs?
Is he still hungry? Should I try feeding him another pinkie?

If you just fed and can't see any lump its time to up the size of the feeders.

__________________
Merlin,
What's Life Without A Little Magic!