Dexamethasone is a hormone, which is used for allergic or autoimmune inflammatory diseases, such as pruritus, neurodermatitis, contact rash, dermatitis, and seborrheic dermatitis. As hormone medication, topical medication has less adverse effects than oral medication, but there are also adverse reactions that occur after long-term heavy use, such as secondary bacterial and fungal infections, local acne, rosacea-like dermatitis, skin atrophy, capillary dilation, etc., as well as itching, hyperpigmentation, erythema and other reactions. However, the use of medication must be a balanced result, and the medication should be used in appropriate and sufficient amounts to treat the disease, and applied according to the doctor’s prescription or in accordance with the instructions. If the symptoms subside within a short period of time, it means that the medication is effective. If the drug does not work in the short term and the symptoms do not subside, you should stop the drug and go to the hospital in time.