Allergic erythema refers to a clinical manifestation of allergic contact dermatitis with erythema on the skin. The symptom is present in all three disease courses: acute, subacute and chronic. Acute contact dermatitis typically presents clinically with well-defined erythema, whereas in the subacute and chronic course, the erythema is mild and poorly defined. Allergic contact dermatitis arises mostly because the patient is exposed to certain exogenous substances, and the contact material is a sensitizing factor, resulting in hypersensitivity inflammation of the exposed skin mucosa. To treat the disease, sensitizers need to be identified, re-exposure avoided and active symptomatic treatment provided. Depending on the severity of the lesions, different strengths of topical glucocorticosteroids are used, such as hydrocortisone cream and dexamethasone cream. If the symptoms are severe, oral antihistamines, such as cetirizine and avastin, should be taken. It should be noted that the disease has a certain incubation period, the first exposure may not occur after the reaction, after re-exposure, usually in 24 ~ 48 hours to produce a significant inflammatory reaction. If the diagnosis of allergic contact dermatitis is confirmed, the medication should be standardized according to the doctor’s instructions.
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