During the study period, patients were prohibited from receiving ultraviolet-ray treatment, nonsteroidal immunosuppressive agents (e.g., cyclosporine, azathioprine and mycophenolate mofetil), topical immunomodulators (e.g., tacrolimus and pimecrolimus), topical corticosteroids, systemic corticosteroids or any other investigational drugs. The washout phase for these treatments ranged from a minimum of three days (for topical corticosteroids and immunomodulators) to a maximum of six weeks (for ultraviolet treatment). The washout period was two weeks for systemic nonsteroidal immunosuppressants and five days for systemic corticosteroids and antihistamines. Patients were permitted to use bath oils and non-medicated emollients during the study period.