A young woman had a persistent facial rash for 10 months that was initially misdiagnosed as dermatitis because early fungal tests were negative. When fungal testing was repeated, it finally confirmed a fungal infection (tinea incognito) caused by contact with a dog. Treatment with antifungal medication alone initially worsened the condition by causing bacterial infection, but combining antifungal and antibiotic medications resolved it. The infection returned after using the same contaminated skincare products, but was successfully treated again with the combined medication approach.