Mustard-plaster

The mustard-plasters (whether first or second in time) are only to stay on long enough to redden, not blister, the skin.

Source: wiktionary

If in a paper on the value of home remedies, however, you offer as fact the statement that mustard-plasters are good for curing colds, you will have to cite a wide and representative sampling of incidents as well as testimony from respected medical authorities to convince your audience.

Source: wiktionary

An intelligent, educated, proud, freedom-loving man, in the image of God, has no other way out save to go as a medico into a filthy, stupid, miserable hole of a town —and all his life consists of cupping glasses, leeches, mustard-plasters!

Source: wiktionary