About a year ago my daughter had a red dot about the size of a pen tip. It hurt and continued to grow. She has had an ultrasound of it and there seems to be calcium inside. We have seen a dermatologist and she didn't think it is concerning but will have it removed - we are waiting patiently for the appointment. The spot now has a dark interior that looks somewhat infected. Does anyone have any thoughts of what this could be? It's the size of an eraser end now and still hurts to touch.