Allergic dermatitis usually takes about 3-10 days to heal after treatment, depending on the individual. Allergic dermatitis is a general term for allergies that cause dermatitis due to various reasons. The main manifestation is the appearance of local skin or the whole body skin erythema, papules of different sizes, and self-conscious itching. Allergic dermatitis can be mild or severe, with milder symptoms requiring no treatment and healing in about 3 days, and severe cases requiring 10 days or more to return to normal. The treatment is generally anti-allergic, topical drugs to stop itching and other symptomatic treatment, try to find the allergen, to avoid re-exposure to allergens as an important measure to avoid recurrence aggravation. During the onset of allergic dermatitis, patients need to avoid eating spicy, irritating foods, seafood and other allogeneic protein foods to avoid aggravating the condition.