I have a mass at the top of my right thigh, in the front, just below the crease area. It s been there for months, but lately has increased in size and seems to be extending in a horizontal direction. It s painful to sleep on that side and causes me to wake up; it is a dull ache and spreads. The best way to describe the throb/ache is like throwing a rock into the water....if that makes sense. It seems to ache right at the spot, then spreads and I can feel it go down my leg. This is recent, the last month or so (the pain and waking me up).