Two weeks ago i detected a very small, painless and movable lump on my knee cap. I went to the doctor and he told me it was something of a cyst in the fatty layer of the skin and that it was harmless. Right now the lump, which is about half the size of a pea, has grown into two nearly identical ones. Both are the same size as before. The lumps are quite hard and don't hurt until i put a lot of force on them.