Total study duration is up to 37 weeks. All subjects receive FP 0.05% cream twice daily up to 4 weeks to all affected sites and any newly occurring sites in ACUTE phase. After randomization in MAINTENANCE phase, subjects either receive emollient twice daily extendedly plus FP 0.05% cream once daily twice a week to all healed sites and any newly occurring sites (Group A), or emollient twice daily extendedly (Group B), up to 20 weeks. In FOLLOW-UP phase, all subjects apply emollient twice daily up to 12 weeks.