I am 31 yrs old, in great health.I just noticed a lump on the outside of my lower left leg , right below the knee area. It's about the size of a half of lemon, but I just noticed it a few days ago. Not sure if I just didn't notice it, or if it is rapidly getting bigger. It is not painful and there is no skin discoloration, it is not sensitive to touch either, Doesn't feel hard