Ringworm and psoriasis are two completely different systems of diseases. Ringworm includes tinea corporis, tinea cruris, tinea pedis, etc. It is caused by fungal infection, and common types of fungi include Trichophyton rubrum, Microsporum canis, and so on. It belongs to a kind of fungal skin disease, mainly manifested as local erythema, desquamation, maceration, vesiculation and itching. Psoriasis belongs to a kind of inflammatory, scaly, recurrent skin disease, its pathogenesis is unknown, may be related to environmental factors, inflammatory factors, genetic factors, etc., the treatment is more complex.