I got bit by something and my knee really hurts now. It seems like the bite gene!

I got bit by something and my knee really hurts now. It seems like the bite generates heat, too; what to do?

I will answer as a nurse who has worked at an emergent care clinic.
Depending on how long you have had the bite, how large it is, and what you got bit by, I would reccommend you go to an emergent care clinic or your family physician's office.
If you just got the bite, it looks small, like a typical bug bite (pencil eraser size, mostly red) put hydrocortizone ointment on it and try your best not to scratch it.
If you have had the bite a couple days, it seems to be getting bigger, it looks like a large pimple it could be an MRSA infection that will need to be treated right away. These often resemble large bug bites and are VERY serious if left untreated (the infection can get into the blood and cause you to become septic, or it can devistate a nearby joint or bone). Please do not "pop" the bite if it has a white head, this will only spread the infection to other parts of your skin and your loved ones.