Hi there!

To me this sounds like it could me a minor meniscal tear. The area of pain doesn't seem to indicate bakers cyst, unless you are getting pain behind the knee as well. The area just inside the patella tendon is usually pain referred from the inside joint line. Do you get any locking or giving way associated?

A couple of quick tests to try is to see if there pain with full knee bend, pain with full knee straighten and then also if there are painful clicks in the knee. If these are all there then its probably a meniscal tear and should heal with physiotherapy and time (you wont need surgery unless there is major locking of the knee which it didn't sound like there was)

One other possible diagnoses is a pes anserin tendinopathy - this is where three tendons join onto the bone at that same area.