The plaster can not be washed off to see if there is allergy. Ointment dissolves in oil but not in water, you can try with turpentine, sesame oil, essential oil, safflower oil, etc. Fragrance oil wind, oil essence and safflower oil can be used externally, there is no stimulation of the skin. Although the effect of turpentine is better, but to use medical turpentine, do not use industrial, to avoid skin irritation. You can clean the surrounding skin with iodophor alcohol before treatment, and then wipe the oil gently with cotton cloth or cotton paper, gradually you can wipe the cream down, pay attention to the surrounding area there is no redness, red rash, etc., to avoid allergies caused by the cream. Be patient when wiping and gradually get rid of it. It can also be cleaned with other disinfectants and oils that can be removed many times over.