: a rare pathogen in actinomycetoma - a case report and review of the literature.

Actinomycetoma is a chronic, progressive bacterial infection characterized by granuloma formation, with being a rare causative agent. A 32-year-old healthy man from El Salvador presented with painless nodules, scars and discharging sinus tracts on his back. Examination of the exudate revealed small white grains, and species were isolated through culture. Molecular identification of was confirmed via 16S rDNA gene amplification and sequencing. The patient was treated with trimethoprim-sulfamethoxazole and dapsone, resulting in significant clinical improvement after 6 months. He continues on this treatment regimen. This case highlights the rarity of mycetoma at an unusual anatomical site and demonstrates the effectiveness of combined trimethoprim-sulfamethoxazole and dapsone therapy.