On my cheeks and forehead I have developed several hard bumps during the past few years. They are getting more numberious and one of them is getting quite large. I finally went to a deritologist who said that it was cause by Calcium build-up around oil glands. When I asked about a treatment I was told to go to a plastic surgeon. What is causing these and other than surgery, what can I do to prevent them and remove the ones I already have?