Aching pain I have had in my left leg?

Hello, I’m inquiring about aching pain I have had in my left leg, for about months now. It centres around a hard lump I have under the knee cap, which is constantly aching (I have gotten X-rays on this and was told it was from a prior injury which I don’t remember having an injury ever) and the aching goes from my hip right down to my ankle. It aches when I walk on it and aches even more when I try to lay down for bed. I’ve tried Alieve with fail and tried Robaxacette which seemed to help a bit with the pain. I’m wondering if u could maybe give me some advice on what may be causing this and if I should get to the doctor. Thank you

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