A 28-year-old woman developed a serious fungal infection (histoplasmosis) after dental surgery that was initially misdiagnosed as a bacterial infection. Although she was treated with an antifungal medication called itraconazole, her condition worsened with larger lung lesions appearing. When switched to a stronger intravenous antifungal called liposomal amphotericin B, she rapidly improved and fully recovered, demonstrating the importance of adjusting treatment when patients don’t respond as expected.