BTW, the image below shows a Baker's Cyst located about where mine is. It's about the size of a medium egg when it's full. It is filled with excess fluid from the knee that is produced by irritated tissues there.
Image courtesy of the Mayo Clinic. (http://www.mayoclinic.org/~/media/kcms/gbs/patient%20consumer/images/2013/08/26/10/52/ds00448_im02893_r7_bakerscystthu_jpg.ashx)
I knew that the cyst was slowly refilling after it was drained a week ago, and while I was at physical therapy (PT) yesterday morning I pushed my knee hard working to increase my range of motion. I accomplished that (150 degrees - mission accomplished) but also forced additional fluid back into the cyst. Pain was present but bearable and mainly irritating so I got an appt. to have it drained again.
This morning the doctor and I discussed the condition and he recommended that we not continue on a path where the cyst is drained over and over because of the (small) chance of infection. He says that once the knee settles down and recovery is complete that the cyst will take care of itself. So instead of draining it again he recommended that I increase my use of anti-inflammatories (e.g., ibuprofen) and continue to ice it after activity and/or in the evenings. So pills and ice it is.
The good news is that I can now go up and down stairs with minimal pain and only a modicum of pressure and stretching in the knee. Don't get me wrong, I'm not ready for the racquetball court or anything, but it's coming along.
Modern medicine is awesome!