The main symptoms of contact dermatitis are erythema, swelling, post-rash, blisters and even bullae with clear boundaries at the contact site, mostly in a single form, with self-conscious burning itching and even burning pain as the clinical characteristics. If the disease is not handled properly, the course of the disease will be prolonged and turn into subacute or chronic, which is characterized by mild erythema, papules, unclear boundary or mild thickening of the skin and lichenoid transformation. 1, avoid using irritating soap: dermatitis appears on the face, and the skin of the affected area is sensitive, so pay special attention when washing your face. Never wash your face with too irritating facial cleanser or soap, which will easily irritate the facial skin or cause facial dermatitis allergy and aggravate the symptoms of dermatitis. 2, do not scratch the affected area: dermatitis on the face will make the patient feel itchy unconsciously. Many patients involuntarily scratch the affected area with their hands in their lives. Although itching can be temporarily solved, it may lead to aggravation of itching later, and even scratch the skin, which will bring secondary damage to the skin. Therefore, patients must avoid scratching the affected area with their hands.