I've had a small lump on the back of my head for a couple of years. 3 weeks ago I scratched it and it opened up. There was a white, horseradish texture substance in it. Since then it has been draining. It has dry, hard, flakes of skin around it. The past few days it has been very sore. The right side nodule on the back of my head, just below the hairline, now has a lump on it and my throat is sore. I feel a little disoriented, also.