<s>[INST] I had a very hard blow to the underneath of my knee it happened about three weeks ago it bruised really bad. The bruise is gone but of anything touches a certain spot the pain is horrible it brings me to my knees. I just want to know what it could be its like a tingling pain just really sharp. [/INST] Hello, The symptoms seem to be related to the knee injury. For the pain, you can use anti-inflammatory medication such as Naproxen three times a day. I also recommend avoiding overuse of the knee. I recommend ice compresses at the area of the piano for relief. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Dorina Gurabardhi, General & Family Physician </s>