Darex, also known as carbotriol, is a vitamin D derivative that inhibits the proliferation of skin keratin-forming cells and induces their differentiation, thus correcting the abnormalities in the proliferation and differentiation of psoriatic lesions. Clinically, it is mainly used topically for the treatment of common psoriasis. Take an appropriate amount of this product and apply it on the affected area twice a day, and the weekly dosage should not exceed 100 grams. Carbotriol is irritating to facial skin and should not be used on the face. After applying the drug, wash the residual drug on the hands. It is prohibited for those who are allergic to this product or have calcium metabolism disorder.