Thanks for giving us an opportunity to help you. The lipomas
can occur in any part of the body except the brain. Their number and size shouldn't be a concern except for the cosmetic purposes. The lipomas can be easily identified by their characteristic feel and examination, and if your surgeon is convinced that it is a lipoma, then in that case you can be assured that it wont be a cancer. Still if you are concerned, you can always visit a pathology lab where they can do a FNAC, a test where in they will take a sample of your tissue and then examine it under a microscope. You should be concerned if the size is increasing fast, the swelling develop redness
or pain and if the skin above the swellings changes in colour or the swelling itself becomes firm.
Rest assured, you need not worry much.