Marshmallow leaf and root are used for ache and swelling (irritation) of the mucous membranes that line the breathing tract. They also are used for dry cough, inflammation of the lining of the stomach, diarrhea, belly ulcers, constipation, urinary tract inflammation, and stones inside the urinary tract.
BENEFITS
1.Relieving coughs. Some herbal and natural cough syrups and cough drops incorporate marshmallow root. 
2.Improving dry mouth.
3.Protecting in opposition to ulcers.
4.Soothing skin irritation.  5.Healing wounds.
6.Protecting the throat from gastric reflux.