Mustard plaster

A mustard plaster, also known as a blister, is a poultice of mustard seed powder spread inside a protective dressing and applied to the body to stimulate healing. It can be used to warm muscle tissues and for chronic aches and pains.^[1] It was once part of conventional medical treatment,^[2] and available in prepared versions in pharmacies. It fell from favor in the 20th century and is now used only as a home remedy.^[3]

Uses

Mustard plasters were used for aches and pains, including rheumatism, arthritis, and sore muscles.^[4] It was also used for chest congestion.^[4]

Side effects

If left in place for too long, it can produce first-degree burns to the skin.^[4] Vapors might cause nausea.

See also

• Mustard bath
• Fanny Crosby, possibly blinded as an infant by mustard plasters