Applied with muscle pain, pneumonia. Mustard plasters are moistened with warm water and applied tightly to the skin on the side where the mustard is smeared, covering the patient with a blanket, usually kept for 10-15 minutes until burning and redness appear. After removing the mustard plaster, the skin is washed with water, with strong irritation - smeared with petroleum jelly.
If there is no ready mustard plaster, you can cook it yourself: dry mustard is diluted in warm water to a mushy state, this slurry is spread on a rag, it is also covered with a cloth on top and applied to the body. So that the mustard plaster does not irritate the skin very much and can be kept longer, dry mustard can be pre-mixed with an equal amount of flour (preferably rye), it is good to add some honey. For children, mustard plaster is sometimes prepared, taking flour 2-3 times more than mustard; and when using ready-made mustard plaster, it is recommended to put it not on bare skin, but through a thin diaper, paper.