The main difference between dermatitis and dermatophytosis is that dermatitis is an allergic reaction disease, which is commonly known as allergic disease, while dermatophytosis is a fungal infectious skin disease. Through the morphology of the rash and the examination of the fungus can identify the two kinds, roughly as follows: 1, dermatitis: usually manifested as red patches of skin, papules, or oozing, usually acute attacks, itching is more obvious, after giving antihistamines desensitization and anti-itching treatment, able to alleviate the symptoms or signs, dermatophytosis usually manifests itself as a rounded erythema, the edge of the pimple may have papules or blisters, erythema will gradually expand outward; 2, dermatophytosis: there is a body of the disease of the skin, but not the skin, but also the skin is not the skin. 2, dermatophytosis: tinea corporis, tinea cruris, etc., usually have a history of pet contact, give fungal examination can be found mycelium, can be clear for fungal infection, that is, dermatophytosis, dermatophytosis in the treatment is mainly based on antifungal treatment, dermatophytosis and dermatophytosis, the main difference between the dermatophytosis and dermatophytosis is that, fungal microscopic examination dermatophytosis is positive.