Itchiness in the area of the injection is usually caused by local skin allergies, such as allergies to antiseptic solutions, commonly used are alcohol and iodophor. If there is an allergy to these two disinfectant solutions, then it is recommended to immediately wipe the surface with water, saline, and then apply topical anti-allergy ointment, such as Benadryl ointment, dexamethasone ointment, dandrufenac ointment, etc. You can also use Chinese medicinal preparations, such as glyburide lotion, all have a very good anti-allergy, anti-itch effect. In addition, there may be an allergic reaction to the drugs typed in, this situation must be noted, in addition to local itching, there may also lead to the entire limb or the whole body of the rash, maculopapular rash, symptoms are also mainly itching, this situation must be immediately given anti-allergic treatment with drugs, generally recommended intramuscular injection of diphenhydramine, intravenous injection of dexamethasone anti-inflammatory, anti-allergic treatment.