The swelling you get behind your knee has been coined the Baker's Cyst after Sir Morton Baker who first described it in 1877, over 100 years ago. Treatment recommendations for typical cysts are compression, ice, elevation and anti-inflammatories. Occasionally they are drained or injected with cortisone. Most commonly the knee is swollen due to underlying arthritis. Here I will try to give some information on the popliteal cyst and treatment options that you can use.
Always check with your health care provider before instituting any treatment.
Here you can find a link to my website with a printable information sheet:
https://www.rosenhipandknee.com/pdf/bakers-cyst-6Nov17.pdf
