Marshmallow leaf and root are used for pain and swelling (inflammation) of the mucous membranes that line the respiratory tract. They are also used for dry cough, inflammation of the lining of the stomach, diarrhea, stomach ulcers, constipation, urinary tract inflammation, and stones in the urinary tract.
People sometimes apply marshmallow leaf and root directly to the skin for pockets of infection (abscesses) and skin ulcers; and as a poultice for skin inflammation or burns, and for other wounds.
Marshmallow leaf is used topically as a poultice for insect bites.
Marshmallow root is applied to the skin as an ingredient in ointments for chapped skin as well as for pain and swelling of the feet and hands due to exposure to the cold (chilblains).