<s>[INST] Hi. I fell on my knee 2 years ago and to this day it sporadically has a tingling/numb sensation. Especially when I touch it. It feels like there are vibrations under the skin. Unsure of what kind of injury it could be. There is very little pain, just discomfort from time to time. [/INST] Hi Hope this message finds you in good health.I have gone through your complaints and understand your concern.There is  delicate nerve beneath the skin on knee that is susceptible to get injured after a fall. If inadequately treated ,it results in neuroma,i.e swelling of nerve that keeps troubling.Physiotherapy,analgesics,anti-inflammatory drugs should help.A local steroid injection would be helpful as wellNothing to worry about.     I hope your question has been answered.If you have any follow-up queries,feel free to consult me anytime.Thanks,Take care,God bless. </s>