The choice of topical drugs should be reasonable. When the skin lesion area is less than 20%, the local topical drugs should be used as the main treatment. When the skin lesion is extensive, the appropriate topical drugs should be combined with the systematic treatment.

        According to the location of the lesion distribution, there are different drug choices. Scalp psoriasis can be selected coal tar agent such as compound coal removal fluid; Facial skin lesions should be non-hormone preparations such as minguo, Ptepi, etc., with less irritation and side effects; Plaque lesions on the trunk and limbs can be treated with anthranol, retinoic acid, medium and potent hormones, and carbolic triol, but long-term use in large quantities is not recommended.

        Psoriasis is different in type and period, and there are some principles in drug selection. Patients with normal progressive stage should reduce stimulation, or use drugs with small stimulation; Moderate to strong glucocorticoids can be used in stationary psoriasis vulgaris, but they can also be used at low concentrations to make them effective while reducing irritation. The concentration should also be gradually increased, and attention should be paid to the presence of irritation at any time. Salicylic acid preparation has a certain effect on static psoriasis vulgaris, the treatment of progressive psoriasis should be careful. In the treatment of erythrodermic psoriasis, irritation should be avoided as far as possible, such as boric acid ointment can be used externally.