Hi. Recently, I Have Noticed That Small Dents Appear And

Hi. Recently, I have noticed that small dents appear and disappear on my skull. Currently, there are two small linear dents on the top of my forehead (on the hairline) and are about 1/2 inch in length. In addition, over the last week, pimples have started appearing and disappear on my skull in various places as well. Please advise.