I have 3 half dollar size lumps on my right forearm near my elbow. They ve been there for over a year doubled in size. The is little pain with movement, worse with activity. I also have a painless lump in my right armpit. It s been there about a year, little growth. Another lump on the back of my left leg, above my knee, sharp pain every now and again. It s about the size of a ping pong ball. Not sure on the growth rate, only noticed it a couple moths ago. Should I be concerned?