I Am A 37 Year-old Female With A Lump The

I am a 37 year-old female with a lump the size of a ganglion cyst on the back of the knee slightly off center on the lateral side. It doesn't hurt when upon movement and I have full mobility of the knee. However, just the lightest touch or pressure on the spot causes localized pain that can best be described as hitting the "funny bone" in the elbow. It does not radiate. However, from time-to-time there is what feels like pressure in the anterior part of the knee down the peroneal nerve distribution all the way to the ankle.