Cassia fistula, commonly known as the golden shower tree, has a long-standing use in traditional medicine systems such as Ayurveda and Unani for the treatment of skin ailments, including boils. Historical texts and ethnobotanical surveys document the use of its pulp, leaves, and bark as poultices or decoctions applied to the skin to promote the drainage and healing of boils and abscesses. The plant is believed to possess purgative, antimicrobial, and anti-inflammatory properties, which may contribute to its traditional use for such conditions.

However, scientific validation for these specific uses is limited. Some in vitro and animal studies suggest that extracts of Cassia fistula exhibit antibacterial and anti-inflammatory activities, which could theoretically support its use in skin infections. Despite this, there is a paucity of well-designed clinical trials or robust pharmacological studies specifically evaluating its efficacy for boils in humans. Therefore, while traditional usage is well documented and some preliminary scientific data exists, the overall quality and quantity of evidence is limited, and the use of Cassia fistula for boils is not yet supported by strong scientific validation.