The skin is red, swollen and itchy after applying the ointment, which is considered to have caused contact dermatitis. The skin is red, swollen and itchy after applying the ointment, which is considered to be an allergic reaction to the ingredients of the ointment, thus causing contact dermatitis, resulting in skin erythema, swelling, oozing, rash, itching and so on. Mild symptoms, stop using medication, keep the skin clean and hygienic with cold water rinse may recover on its own, if it can not be relieved you can choose some medication, such as topical glycerine lotion, compound dexamethasone ointment, etc., itching is serious if you are taking loratadine, cetirizine and other antihistamine medication. It is recommended to go to the hospital for examination first, and the drugs need to be used under the guidance of the doctor.