Mostly a bruise: http://www.sw.org/misc/health/Hoffa%27s%20Disease%20%28Infrapatellar%20Fat%20Pad%20Syndrome%29%20with%20Rehab-SportsMed.html This varies a lot, but often it is like a localized bruise that doesn't last long and goes away with rest on its own.
Answered 5/12/2015
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