Clinically we often meet the following situation, because the skin problems, often not taken seriously, often if there are facial problems (facial lesions) or because of itching, or lower body problems, do not go to the hospital, usually from the drugstore to buy some drugs to personally try the body. I do not know, dermatological topical drugs often cause the following adverse consequences: 1, hormone drug abuse If the face commonly used hormones, day after day, there will be facial skin redness, the skin becomes coarse, pores increase, or even facial pigmentation that is brown-black spots, and facial hair. If eczema is often reduced after use, the lesions will increase and worsen after discontinuation; if psoriasis patients apply hormones for a long time, most of the symptoms of psoriasis patients will worsen after discontinuation, and even pustular psoriasis or erythroderma will appear; clinically we also encounter patients with baldness, which can often be cured quickly by traditional Chinese medicine, but due to careless treatment, local injection of hormones can often cause permanent hair loss, or even total baldness. If you use the right medication, but the concentration of the medication is different in different parts of the body, it is likely to cause artificial “drug allergy”, for example, if the concentration in the sweat glands, such as the armpits and scrotum, is “too high”, it will cause “drug allergy”. If the concentration is “too high”, it will cause the so-called drug dermatitis, local erythema, swelling and so on. How should we choose the correct drug? 1, the patient for the first time, regardless of the choice of drugs and formulations, it is best to use a small area first, observe 24 hours, such as no adverse reactions, and then expand the area of medication. 2, according to the needs of the disease and the nature of the drug, you can choose different forms of topical drugs, such as powder, water, lotions and tinctures, creams and ointments. Generally in the acute inflammation period, manifested as redness, blistering, erosion, more choice of aqueous wet compresses, with anti-inflammatory, heat dissipation and other effects; to reduce the redness, swelling, exudate reduction, the use of paste and powder, etc., can play the role of anti-inflammatory, anti-itch, astringent, protective; lesions thickened, moss-like changes, it is necessary to use ointment treatment, because it has a lasting effect and the role of lubricating the skin. 3, the choice of drugs should also take into account age, gender and disease site and seasonal factors. Such as young and old patients should choose low concentration of drugs; breasts, vulva, do not use high concentration or irritating drugs, palms, soles and other places can use higher concentration of drugs; skin sensitive patients, you can first use low concentration, followed by high concentration. 4, dermatology medication time and frequency should not be ignored. Water and lotion, every 3 hours to apply 1 time. Tinctures and ointments have a long-lasting effect and can be applied once a day in the morning and once in the evening. Wet application method should be moderate, the affected area should be cleaned and disinfected before using the medicine, scabs can be softened with vegetable oil, blisters larger than 0.5 cm in diameter should be extracted with a sterile syringe, and the wall of the blister should not be removed. Hairy parts need to use powder or paste, to shave the hair before using the drug. 5, dermatological drugs, pay attention to observation, once the occurrence of erythema-like or eczema-like rash, or accompanied by itching, pain and other allergic reactions, should be immediately discontinued, promptly go to the hospital for treatment.