1. A skin biopsy (removal of a small tissue sample for microscopic examination) will be done at the first visit (week 0) and again at weeks 6, 14 and 22. The area of the biopsy will be numbed with an anesthetic, and a small circle of skin about the width of a pencil eraser and half as deep will be cut and lifted away. Stitches will be placed and removed 1 to 2 weeks later.