It could be a wound from scratching, it could be anything actually. It could be cancer. You will never know without going and having it checked out. I hope it is nothing, but like Doggiedad said; go to a vet for your own peace of mind.
Thanks for the feedback and we will head to the vet but I know there are vet techs here, maybe even a vet, and regardless there are breeders / owners who had seen this before if it is common. If nothing else I'll get a bunch of "I've never seen that before!" and that's helpful as well. I do plan to take him to the vet but in the meanwhile if people online can critique hip xrays there's a good chance they can help diagnose other things from experience.
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and Lady - snuggle extraordinaire!