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Chronic and infected wounds, such as diabetic ulcers, pose significant health challenges in Thailand, particularly in rural areas with limited access to advanced care. Conventional dressings often lack cost-effectiveness and sustained-release capabilities, while traditional extracts like Terminalia catappa degrade rapidly. This study proposes an innovative, sustainable solution: a fish-scale-derived biochar drug carrier. By utilizing agricultural waste to create a high-surface-area, porous reservoir, this approach enables the controlled release of T. catappa’s antibacterial phenolic compounds. This integration offers an affordable, long-lasting therapeutic strategy for managing chronic wound inflammation and infection in community-based settings.