Is allergic dermatitis contagious?

Allergic dermatitis is not contagious. Allergic dermatitis is a skin inflammation caused by skin allergy. The specific allergens are complex, which can be food allergy, food additive allergy, drug allergy, inhalation allergy or skin allergy caused by external contact substances. Therefore, the specific causes of allergic dermatitis are complex, but they are not infectious. Allergic dermatitis can be manifested as erythema, papules, colliculus, blisters, erosion, exudation, etc., accompanied by obvious itching, generally requiring active anti-allergic treatment.