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Hi and thanks for the query.
This could be due to tendinitis or an inflammation of the knee joint capsule following the lunges. It is supposed to take 5 to 7 days to settle and not having swelling and stiffness rules out arthritis of the knee joint. I can not comment on the shadow? on the fibula, it can be an artifact or a soft tissue swelling but I do not see any reason why any swelling or shadow on or near the fibula will cause pain in the knee joint. Rest, ice, compression and elevation is the right thing to do at this point in time. A knee brace and application of an anti inflammatory over the counter liquigel like Motrin or Brufen gel will be effective.