A poultice is used for similar purposes to that of a compress, except we use bruised leaves or other plant material such as pulped root or bark paste instead of a cloth soaked in an infusion or decoction. The plant material can be applied directly on the skin or put between two thin layers of gauze. If you frequently use a poultice, for example for rheumatic joints, it may be worth sewing a couple of thin muslin bags to put the poultice in. Cover the skin with a little oil to protect the skin and the make removal of the poultice easier if you are applying the plant material straight unto the skin. Leaves can be briefly scalded in hot water and then bruised with a rolling pin or clean bottle. Dried plant material is made into a paste with hot water or cider vinegar. Like a compress, the poultice can be kept warm with a hot water bottle.