Hi there!
Well, without an evaluation and probably a few tests it would be difficult to point out the cause of your symptoms. Possibilities include tendon/ ligamental tears, meniscal injuries, fractures, patellar dislocation, inflammations etc. It would be best to get this evaluated by an orthopedician or a sports medicine doctor at your earliest convenience, for an accurate diagnosis and appropriate management. Meanwhile you may try resting the knee, application of ice packs and some OTC NSAIDS if the pain is severe.
Hope this is helpful.
Take care!
Dang only 80 pnds, must be going for reps not muscle? haha kidding. Lets see man well pain came from the pop and the pop came from Id say your knee cap considering you were squatted down. But then up and pain subsided. Possibly knee cap moved back in place. Now then in morning knee lil swollen, pain when walking, no bending or squatting which would lead my proffessional opinion to be you over streched tendons, possibly a slight tear. Use an ice pack for 2 days twice a day 30 mins each. No more weights till Friday. If everything returns to normal leave the squats out for an additional week. However by this Friday if knee is still the same, go see family doctor. Be smart and avoid all the costly tests. A simple xray will eliminate a lot of possibilities. Hope that helps, thanks
Most likely you have fluid on your knee! I suggest seeing an Orthopedic MD and have an X-ray