Prickly heat, or corn rash, is different from sweat rash in terms of pathogenesis, location, clinical symptoms, treatment, prognosis and so on. 1. Pathogenesis: Corn rash is triggered by sweat retention in the sweat ducts, and the flow of sweat into the surrounding tissues after the rupture of the sweat ducts, leading to an inflammatory reaction. Sweat herpes specific etiology is not clear, mostly considered as a kind of eczema-like reaction. 2. Happening parts: Corns are mostly found on the neck, back, shoulders, chest and other parts of the body that are rich in sweat glands. Sweat rash occurs symmetrically on the palms of the hands, fingers, soles of the feet, lateral edges of the toes and other parts of the body. 3. Clinical symptoms: the lesions of herpes cornuus are mainly small papules surrounded by a red halo, accompanied by a tingling sensation, itchiness and so on. Herpes sweat lesions are small blisters slightly above the surface of the skin, usually not surrounded by a red halo, accompanied by itching, tingling, sweaty hands and feet and other symptoms. 4. Treatment: most of the corn rash through the skin cooling, drying and other treatments can disappear on their own, the symptoms of severe cases can be prescribed topical glycerine lotion, hydrocortisone solution and other treatments. Sweat herpes can be prescribed short-term oral hormonal drugs, such as prednisone, methylprednisolone, etc., can also be used externally with hormonal creams, such as tretinoin cream, hydrocortisone cream. 5. Prognosis: Herpes cornuus is a self-limiting disease that can be cured, but it can recur when affected by the environment. Sweat herpes is more difficult to cure and usually recurs every year. These are some of the differences between the two diseases, it is recommended to consult a professional doctor for differential diagnosis.