Indian Kinotree (Pterocarpus marsupium), also known as "Vijaysar," has a longstanding history of use in traditional Indian medicine, particularly Ayurveda. The gum or resin exuded from the bark, known as kino, has been applied externally for various skin conditions, including carbuncles, boils, and wounds. Traditional Ayurvedic texts describe its astringent, anti-inflammatory, and antimicrobial properties, which are believed to aid in the healing of suppurative skin lesions such as carbuncles.

However, direct scientific studies investigating the efficacy of Indian Kinotree specifically for carbuncles are lacking. While some research has confirmed that extracts from Pterocarpus marsupium possess antimicrobial and wound-healing activity in vitro and in animal models, clinical trials or rigorous scientific evaluations for the treatment of carbuncles in humans have not been published. The traditional use is likely based on empirical observation and the general anti-infective and astringent effects of kino resin.

In summary, the use of Indian Kinotree for carbuncles is primarily justified by traditional Ayurvedic practice, with some supportive (but indirect) scientific evidence of relevant pharmacological properties. The strength of evidence remains limited, and more research is needed to validate its effectiveness for this specific condition.