wow! black skin! I have been looking for a nice dark skin one myself, if i was you lol i would keep this one just for the dark skin, as she gets bigger those pretty flowers will just pop compared to the dark bark.

I would say oddity. Was hoping that there would be someone who could answer you. Does it rub off? Usually see a black caudex too. Maybe what the seed was crossed to. You only have the one? Well overall it looks healthy. Let us know if there are changes.