Pain Under Knee Cap I Have A Horrible Knee Pain Under My Knee Cap?

I have a horrible knee pain under my knee cap? - pain under knee cap

I stayed at the Skate Park on Saturday. I have a terrible pain in my knee right knee Burnes and stings, when I suggested that skinn or when I kneel. it does not hurt when I walk or skate to their state 4 days and it still hurts. My parents say that the knee was a bit of juice in motion, if misplaced, it really hurts! I will not go to the doctor, because medical costs are high, what should I do? Or is it now I'm surfering wat?