Suggest Treatment For Knee Swelling

My knee is swelling to the point where if i bend it, it feel as if it were to burst. I did no heavy physical activities to cause it to swell. No current or previous injuries. There is absolutely no pain whatsoever just the fact that I get some resistance when I bend my knee from the swelling. I am 15 years old and a male and I have a Taiwan trip tomorrow and I need to know ASAP. Please and thank you!