Lichen planus is a dermatophyte infection involving the hair and scalp, a type of tinea capitis, with lesions and itching visible as early symptoms. 1. Skin lesions: mostly on the top of the head. At the beginning, they are white scaly patches with gray hair and mild itching. Around the lesions are scattered satellite-like white small scaly spots, which can be fused into a piece, with clear boundaries. 2. itching: generally no obvious self-conscious symptoms, occasionally with different degrees of itching, itching symptoms are mild. Tinea versicolor is a disease that only involves the local skin and does not require emergency treatment. When diagnosed, isolation and disinfection measures should be taken, and a comprehensive treatment plan should be adopted, including taking medication, applying medication, shampooing, haircutting, and disinfecting. Ringworm does not destroy hair follicles, does not cause permanent hair loss, and leaves no scarring.