I had a puffy knee after playing basketball, not recognizable injury during play. I can walk without a limp but cannot play it is tender, puffy gone?

See orthopedist. Fluid on joint with activity is usuaally something to get looked at cartilage tear knee cap arthritis to name a few.
Puffy knee. How often does it occur? How long does it last? Did you have a previous knee injury? Is there any pain and if so where? If it continues check it out with your orthopaedist.