I would have an ENT doctor check it out. Usually, if it moves, it's not serious. Check with doctor he may request scan. Good Luck
Do you have any sores on your scalp? I had this same issue and was worried. I went to the urgent care and the doctor asked me if I had a sore on top of my head that I would pick at and not let heal... I was embarrassed to admit it, but it was true. After I put antibiotic ointment on it and let it heal, this went away.