Chronic dermatitis may be caused by allergic reactions, fungal infections and other diseases, and can be treated by using anti-allergy medications, anti-fungal medications, and lifestyle modifications. 1. Chronic dermatitis caused by allergic reaction Oral anti-allergic drugs: such as cetirizine hydrochloride, loratadine, chlorpheniramine maleate and so on. Topical anti-itching and anti-allergy creams: such as glycerite lotion, budesonide cream, hydrocortisone cream, mometasone furoate cream, etc. 2. Chronic dermatitis caused by fungal infection Take antifungal drugs: such as fluconazole, itraconazole, etc. Topical antifungal ointment: such as miconazole nitrate ointment, clotrimazole cream, terbinafine cream. Usually also need to pay attention to personal hygiene and cleanliness, avoid sunlight exposure to the skin, do not eat allergic food. The above oral drugs have drowsiness, dizziness, gastrointestinal irritation and other adverse reactions, topical ointment can appear burning sensation of the skin, skin sensitivity increased and other side effects, in the use of these drugs, must strictly follow the doctor’s instructions under the guidance of the doctor.