Hardened bump/cartilage and side knee pain when bending

Patient

Q: Hi,
There is some kind of hardened bump/cartilage that appeared on top portion of knee side(facing right leg) of my left knee.

When I bend my leg I can feel it grinding and it can be a painful to bend full when it appears, but after couple of hours it is only uncomfortable to bend it fully. This thing used to appear previously too, once or so a year, but usually would go away after couple of days. This time I have it for over a week and it has not disappeared. I do not believe there was any trauma to the knee as it appeared after long sitting when i stood up from a chair.

Any idea what it could be?

Symptoms:  Uncomfortable side knee pain when bending
Images: 
Hardened bump/cartilage and...-1 Hardened bump/cartilage and...-2
Doctor

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