I am 23, fairly active and have been suffering from activity induced pain in my right knee for at least two years. I cannot recall when it began and haven't suffered any injuries that I can attribute it to.
The outside of my right knee becomes extremely tender to touch and pressure and I will have a dull ache for hours after considerable activity. Stairs and ladders specifically will aggravate the condition. I have found relief from an elastic "ace" bandage worn when I work out or jog and that seems to prevent 90% of my pain but I am still concerned.
Additionally, there is a bump about one inch above the top of the fibia that protrudes considerably more on this knee than my unaffected knee.