Diseased Leg?

OK, I went to the doctor yesterday to get a physical, and they found out I have a disease in my leg! Yes, the doctor did call it a disease, and some weird words before it.

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Like the Flimorigianjombonian disease or something. All it is is that my bone is like, below my kneecap, which is where it should be. So, there's this bump of where the bone is an inch below the kneecap. It's weird...