Tinea corporis and tinea cruris incidence, risk factors, and treatments in a cohort of 6.8 million patients with Medicaid, United States.

Tinea corporis and tinea cruris are common dermatophyte infections of increasing public health concern, yet national US data are limited. We estimated incidence, risk factors, and diagnostic and treatment practices among a large Medicaid-insured outpatient cohort. Among ∼6 800 000 enrollees, 54 108 were diagnosed with tinea corporis (79.1/10 000 person-years) and 8386 with tinea cruris (12.2/10 000 person-years). Tinea corporis primarily affected young children and Black patients, while tinea cruris was prevalent among middle-aged men. Overall, <10% received diagnostic testing, and 7%-10% were treated with combination antifungal-corticosteroid products, highlighting the opportunities to increase testing and promote judicious antifungal use amid emerging resistance.