Usually the dangers of tinea versicolor are specifically manifested by itching, contagion, bacterial infection and onychomycosis. 1. itching: usually tinea cruris is accompanied by itching, so it may affect the patient’s life and work. 2. Contagion: tinea cruris can be spread on one’s own skin through direct contact, leading to infection of tinea corporis, tinea pedis and tinea capitis, etc. It can also be infected to others through direct or indirect contact. 3. Bacterial infection: tinea cruris is easy to cause scratching due to itching, and usually after patients scratch, it may cause bacterial infection and aggravate the condition. 4. Ringworm of the nails: Since ringworm of the hands is a fungal infection, it is possible that the nails will also be infected with fungi, which may lead to ringworm of the nails. Patients with the above manifestations should actively seek medical treatment and carry out relevant treatment under the guidance of professional doctors.