Magnesium sulphate paste is a white paste used on the skin for the treatment of boils and carbuncles. It is also known as a "drawing paste" and can be used to draw out toxins and impurities from minor wounds and infections such as splinter wounds, ingrown nails, abscesses, warts, and verrucas. Magnesium sulphate paste contains dried magnesium sulphate as the active ingredient, along with phenol and glycerol. It should not be used on broken skin or if you are allergic to magnesium sulphate or any of the other ingredients. It is important to talk to your doctor or pharmacist before using magnesium sulphate paste, and prolonged use should be avoided.