Tacrolimus (FK-506) is a new immunosuppressive agent that acts by inhibiting T-cell activation and cytokine release. It offers a safe and efficacious alternative for many skin conditions. It minimizes the need for topical glucocorticoids and does not cause skin atrophy. Tacrolimus was first reported for treatment of vitiligo in 2002. The underlying mechanism was shown in an in vitro study that topical tacrolimus promoted proliferation of melanocytes and melanoblasts.