The itchy part of the patch is generally contact dermatitis and may have an allergic reaction to the adhesive tape. Once this happens, it is recommended that the patch be stopped, and the itchy part be careful not to wash it with hot water, nor with soap or body wash, and try not to scratch the stimulus. If the lesions become larger after stimulation, you can apply topical mometasone furoate cream or compound flumethasone ointment twice a day, and if the itching is more severe, you can take oral anti-allergy medication, such as cetirizine, loratadine, imipramine tablets, etc. If the treatment is still not relieved, there is exudation can be used skin disease lotion or Chinese medicine boiled water wet compresses, do not use topical creams and other treatments for the time being.