Allergic dermatitis eczema, also known as contact dermatitis, is an acute or chronic inflammatory reaction that occurs at the skin mucosa contact site due to exposure to certain exogenous substances. The treatment of contact dermatitis is divided into systemic medication and topical medication 1. Systemic medication: depending on the severity of the condition, antihistamines or glucocorticoids can be taken internally. Prednisone 20mg twice a day can be used to treat severe, generalized inflammation, after a short course of treatment generally do not need to gradually reduce the amount (under the guidance of a doctor to take). 2, topical medication: can be treated according to the treatment of acute, subacute and chronic dermatitis. In the acute stage, the redness and swelling can be obvious with topical glycolite lotion, and when there is much exudation, cold wet compress with 3% boric acid solution for 15-30 minutes each time, several times a day, for 1 to 3 days until the exudation is controlled. In the subacute stage, glucocorticoid paste or zinc oxide oil can be used topically when there is a small amount of exudation, and glucocorticoid cream when there is no exudate. Topical antibiotics are added when there is infection. In the chronic stage, ointments with anti-inflammatory effects are generally used. The actual diaper dermatitis should be changed at any time, keep the pubic area and buttocks clean and dry, use less soap to avoid aggravating the irritation, and topical zinc oxide oil can be used topically. The treatment of contact dermatitis is to identify the cause, quickly remove the contact and actively treat the symptoms. After the hypersensitivity contact dermatitis is cured, you should try to avoid contact with the allergen again to avoid recurrence.