Morinda, particularly Morinda citrifolia (commonly known as noni), has a longstanding history in traditional medicine across Polynesia, Southeast Asia, and parts of India. Traditionally, various parts of the Morinda plant, including the fruit, leaves, and roots, have been used for a range of skin ailments, including acne, boils, and sores. The rationale is often based on its purported anti-inflammatory, antibacterial, and wound-healing properties, as described in ethnobotanical sources and traditional pharmacopoeias.

Scientific research on Morinda’s efficacy for acne is limited and largely preliminary. Some in vitro studies have demonstrated that noni extracts possess antibacterial properties against certain skin pathogens, such as Propionibacterium acnes and Staphylococcus aureus, both implicated in acne development. Additionally, antioxidant and anti-inflammatory activities have been reported in laboratory studies. However, there are no robust clinical trials directly evaluating Morinda (noni) for the treatment or prevention of acne in humans. Most scientific literature highlights the need for more comprehensive studies before any firm recommendations can be made.

In summary, the use of Morinda for acne is primarily supported by traditional usage, with modest and indirect scientific evidence suggesting potential mechanisms, but lacking direct clinical validation.