A 66-year-old farmer developed a deep skin fungal infection from a biological pesticide she used for over 10 years. The pesticide contained a fungus called Purpureocillium lilacinum, which is normally harmless to healthy people but caused repeated skin lesions on her face and arms. She was successfully treated with antifungal medication (itraconazole) for three months, and her skin fully healed without returning. This is the first reported case showing that biological pesticides can pose health risks to workers who handle them regularly.