Senna is a very good colon cleanser and can be used to relieve severe cases of constipation. Because senna leaf is an anti-bacterial and anti-inflammatory, it also helps to reduce hemorrhoids swelling due to irritation. Senna is best used for short periods, never on a regular basis. Continuous use can lead to health problems as well as lazy bowel syndrome. Making a paste from senna leaf is also good for skin conditions such as acne, ringworm, and wounds. Chewing the leaf can help combat mouth infections and gingivitis.