I have these very hard type pimples that come out only on the right side of my face and are just below the skin surface. I've had them removed professionally several times and they seem to keep coming back bigger and wider. They are very noticable and when removed they are of a white hardened substance surrounded by an oil. I would like to know the underlying cause and if there is something I can do to prevent this from continuing to happen. I tried using different makeup, have used masks, and have gotten micro dermabrasion done. None of these prevents them from returning. I have looked up calcium deposits, but I don't think that is it from the info I've read. Can you help me with this problem?