 14. Subjects who have been treated with any topical anti-psoriatic e.g., salicylic acid, anthralin, tar, etc., any topical corticosteroid medications, topical retinoids e.g., tazarotene, tretinoin, topical Vitamin D analogs e.g., calcipotriene, topical immunosuppressants e.g., tacrolimus, pimecrolimus within 2 weeks prior to study entry. 