Used for muscle pain, pneumonia. Mustard plasters are moistened with warm water and applied tightly to the skin on the side where the mustard is spread, covering the patient with a blanket, they usually hold 10-15 minutes until burning and redness appear. After removing the mustard, the skin is washed with water, with severe irritation - smeared with petroleum jelly.
In the absence of ready-made mustard, you can cook it yourself: dry mustard is diluted in warm water to a mushy state, this slurry is spread on a cloth, it is also covered with a cloth on top and applied to the body. So that the mustard is not very irritating to the skin and can be kept longer, dry mustard can be pre-mixed with an equal amount of flour (preferably rye), it is good to add a little honey. Mustard plasters are sometimes prepared for children, taking flour 2-3 times more than mustard; and when using ready-made mustard, it is recommended to put it not on bare skin, but through a thin diaper, paper.