Tinea cruris is a contagious disease caused by a fungus that adheres to the surface of the skin. It generally occurs most commonly around the thigh roots or buttocks; therefore, its treatment falls within the scope of dermatology. You can seek treatment in the dermatology department of a regular hospital. The most common treatment plan involves the topical application of antifungal creams, with a treatment duration of at least one to two months or more. For tinea that is more persistent and has been present for a longer time, it may also be appropriate to combine treatment with some oral antifungal medications. During treatment, it is important to maintain a regulated diet and lifestyle habits. It’s advisable not to keep small animals at home, and if you have athlete's foot, it is best to treat it concurrently. Socks and underwear should be washed separately and exposed to the sun for disinfection to prevent cross-infection and recurrence of the disease.