I have a problem and i think it serious. Please Help!?!

I have a problem and i think it serious. Please Help!?

Here the story. Last sunday i was riding my skateboard and i was going really fast and so i lost my grip on the board and i slip and fell hardly and scrape my knees and hand. Now this is my first time falling from my skateboard. So i put some bacteria cream on my knees and hand and cover it with band aid. On tuesday, my hand was heal and my right knee was okay but my left knee is not. My scrape on my left knee is the size of an eraser so i use two band aid to cover it. Yesterday i start limping because my left knee cant bend. And now yellowisg liquid is coming through the band aid. Please i really need some help on this situation and i cant go to the doctor becasue im very busy lately. HELP!! I dont want to lose my left leg....Im very athletic.

Yea it's probably infected if your knee swelled up. That use to happen to me a lot when I was younger, my knee would get a bump of puss the size of a softball. It was nasty and it always made me limp for a while, and usually after a few days the swelling went down (sometimes it would take a week or so). The on thing you have to worry about is getting a staph infection which do occur a lot when people scrape their knees. But unless it's something like a staph infection, it probably won't kill you, though that is a possibility if you fell in dirt and stuff. Usually the body will fight that stuff off since the stuff that causes a staph infection is everywhere. If the swelling doesn't go down by Sunday, go to the doctors on Monday. But I wouldn't run to the doctor for every little infection you get. How is your body going to develop an immune system if you're running to the doctors and getting antibacterials every time you fall down. If you want to be crazy hypochondriac, go to the doctors tomorrow, but if you give it a few days, I'm sure it will go down.

Good luck with the knee, keep shredding the gnar.