Is the pain under your knee cap or tendon? From what you are saying it sounds like your saying under your knee cap.
You could have patellofemoral syndrome; very common for cyclists (read your bio). Try this website.
http://www.med.umich.edu/1libr/sma/sma_patellod_sma.htm
Rest will not only the solution, kindly suggest, which thing make tendon powerful?
hi mac,
there is a high possibility that your tendons need some rest. Maybe that's why they are sore. Once a tendon become sore, it releases inflamatory chemicals for warmth and this can cause pain in the affected region. SO take rest,
regards