How long can dog skin plaster be used? Do I have to change it every day?

Black plaster is commonly known as dog skin plaster. Authentic black plaster can be used for about 10- 15 days, which is related to the season and has different skin absorption capacity. Before applying the plaster, dry the place where the plaster is to be applied with a hot towel, which is conducive to the opening of the capillaries in the affected area and the better transdermal absorption of the drug. Dog skin plaster should be baked on candles and alcohol lamps first, or floated on boiling water to soften it. After the plaster is softened, apply it to the affected area when the temperature is suitable. Note that the plaster can't be baked on the gas stove, because harmful gases such as carbon monoxide and sulfur dioxide produced during gas combustion will be absorbed by the plaster matrix and water, and then enter the human body through the skin, which is harmful to the body.