With the continuous enrichment of commercially available drugs, there are more and more topical drugs for skin diseases. As some patients with skin diseases either blindly buy drugs on their own; either drugstore clerk recommended to buy drugs; or biased listening to television, newspaper ads to buy drugs for some inappropriate treatment, without knowing that some indiscriminate use of drugs can not play a therapeutic role, some indiscriminate use of drugs will aggravate the disease; some indiscriminate use of drugs will cause difficulties in diagnosis and treatment. Therefore, it is urgent to standardize the external use of dermatological drugs. The skin is the body’s natural barrier, used to defend against all external attacks. When its barrier function is not sufficient to defend against external attacks, it may cause some skin diseases. Many internal diseases can also manifest themselves in different ways on the skin. There are quite a variety of skin diseases and their diagnosis and treatment are very complex. At the beginning of summer and autumn, there is a high incidence of various infectious and allergic skin diseases. The more common infectious skin diseases are usually caused by bacteria, fungi, and viruses, etc. The diagnosis and treatment of these three infectious skin diseases are very different in approach, and none of them are suitable for glucocorticoid treatment. A common clinical mess is that glucocorticoid preparations are used to treat ringworm. The possible reason is that most of the various fungal-induced dermatophytoses have varying degrees of itching, and glucocorticoid preparations can relieve the itching symptoms of ringworm, so some patients blindly use them for a long time until the lesions expand and cannot stop themselves. In particular, ringworm on the face can easily form indistinguishable ringworm, which is highly confused with dermatitis and eczema disease. Even in primary care hospitals, this can lead to misdiagnosis and mistreatment. Another contradictory situation is: hand and foot sweat herpes; hand and foot eczema happens to be considered by some patients as ringworm and is treated with antifungal creams that do not heal for a long time. Papular urticaria is a common skin disease caused by allergic reactions, but some patients or primary non-specialist clinicians think it is a viral skin disease, and use acyclovir ointment to treat it. The list goes on and on.