Presents a case of a 46-year old man with deep dermatophytosis following a renal transplant. Invasion of the deep tissues by the fungus Trichophyton rubrum in immunocompromised patients; Serous fluid from multiple sinuses in the left foot; Histopathological examination of the exudate; Importance of considering the superficial fungus in the differential diagnosis of deep mycoses in immunocompromised patients.