i have a lump below my knee towards the inside of my leg, i hve discoloration, brownish color, in a vein pattern close by, lump is somewhat sore to the touch and gets bigger the longer i stand, i had an ultra sound today but the tech could not see it on screen but of course could feel it, i also have one behind my heel that she could see but that one doesnt get bigger and is not sore to the touch, just looking for an opion on what it might be?