The lumps under your skin may be even easier to treat than hernias or cholesterol deposits. There is a strong possibility they may be a benign, not dangerous type of fatty growth called a lipoma. Lipomas form for no known reason, and some people can get several of them. They are collections of extra fatty tissue in lumps, and can be removed with skin surgery usually just under local anesthesia with no need for a hospital.
I would recommend starting out with a visit to a board-certified dermatologist to determine if your growths are these harmless lipomas, and then decide together if you would like to have them removed. A few stitches may be involved, but you may be more comfortable with small surgery scars than with the lumps as they are now.
If they are not lipomas, then I agree it's not a bad idea to possibly get a painless ultrasound test to see if they are hernias or something deeper.