it's Patellar Femoral Syndrome (aka Patellofemoral syndrome, aka chrondomalacia patella), and there is no "cure," only treatment (exercises, stretches, icing, etc.) that causes the problem to recede to unproblematic levels. Basically, it's a problem caused by the mistracking of the kneecap.
I've had it for years, and it was mostly under control until I fell on the ice a few months ago. The resulting bruising made the whole area sore and inflamed again, and the problems have gotten worse from there.
i'm sorry to hear that. do you plan to take any time off for it? i hope you're at least running less