Any chance that it's Osgood Schlatter syndrome? Basically, there is a disruption of the tibial growth plate causing the tibia to protrude below the knee after a period of rapid growth. It's relatively common in older children, especially active children. In fact, my husband had it when he was younger. Your son seems a little young, but Osgood Schlatter was my first thought when I read your post.
I second the pp...I had Osgood Schlatters when I was young, about 9 or so. So 7 doesn't seem too young. Might be a good idea to get the Orthopedic Surgeon's opinion before too long. When you press on the lump does it move, or does it seem stuck in place?
I had the same thing as a child on both knees (below) and still do, just less painful and less pronounced. I'm 20yo. I'm curious to hear about the results. Good luck!
Me (25) DW (26) DD1 (8) DD2 (6) DD 3 (3)
Two cats, two dogs, complete chaos.
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