When the weather is hot, I get a rash. Why?

Disease analysis: In this case, it is eczema. At present, western medicine has no specific treatment for eczema, and most of them adopt symptomatic treatment. Oral antihistamines such as diphenhydramine, phenamine, chlorpheniramine, cyproheptadine, etc. , can be used alone or in combination with sedatives and vitamin C. The dosage form for external use depends on the clinical manifestations of skin lesions. If there is obvious swelling and exudation, cold and wet solution should be used, and lotion, emulsion, mud paste and oil agent can be used for erythema and papules. Oil is needed for blisters and erosion; Ointment is used for those who show scales and scabs; If lichen changes, choose mud paste, ointment, emulsion, film coating, tincture and plaster.