High quality digital medical photographs of palms and soles will be taken at Day 0, Weeks 4, 16 and 28. In addition, one optional skin biopsy from a palm or a sole will be performed at Day 0 and Week 16 and pus will be collected from pustules on palms and/or soles at Day 0 and Week 16. Finally, blood will be collected at Day 0 for genetic analysis from every patient who consents to DNA blood sampling.