According to a search, here's what I found about noni:
Traditional uses of the noni plant are varied and virtually every part of the plant is used as some form of medicine. Healers used noni leaves as a bandage or poultice for wounds. Young, green fruits were crushed and the extracted juice was used as a remedy for lesions or sores in the mouth. Root or stem bark was typically used to treat inflammation or infections. Other conditions treated with noni include fevers, skin disease, respiratory problems, gastrointestinal upset, menstrual or urinary problems, diabetes, and venereal diseases. Research into the traditional uses of noni indicate that it was the second most popular plant used in herbal remedies with approximately 40 known and recorded formulations. Noni is included in the traditional pharmacopoeias of Native Hawaiians, other Pacific Islanders, and Asian populations.