Seborrheic dermatitis is a multi-infarct and common disease in dermatology, especially in young adults. It is commonly found on the head and face, manifesting as scaly red spots on the face, gray-white bran-like dandruff on the head or greasy scaly patches, seriously affecting people’s health and beauty, causing great mental stress to patients and affecting work and study. How is seborrheic dermatitis caused? The exact cause and pathogenesis of seborrheic dermatitis has not been fully elucidated. However, numerous studies have shown that the pathogenesis of seborrheic dermatitis may be related to genetic, immune, neurological, hormonal and environmental factors. It is also related to digestive malfunction, excessive consumption of sugar and fat, mental stress, overexertion, bacterial infection, and vitamin B deficiency. The abnormal sebum composition and excessive sebum secretion is the basis for the development of seborrheic dermatitis. On this basis, there may be an increase in the number of Malassezia, or the surface secretion of excess free fatty acids to stimulate the skin and cause inflammatory lesions on the skin in that area. What are the manifestations of seborrheic dermatitis? Seborrheic dermatitis manifests as inflammatory skin changes in seborrheic (oily) areas such as the scalp, face, upper chest, and armpits, and there are dry seborrheic dermatitis and oily seborrheic dermatitis. In dry seborrheic dermatitis, the skin is dry, and the scalp is flaky and itchy. Oily seborrheic dermatitis occurs in people with a lot of oil, commonly as greasy yellow-red patches, papules, heavy may have vesicles, oozing and greasy crusts, often itchy, slow, recurrent. If secondary bacterial infection occurs and pustules or even ulcers appear. In some cases, the rash may develop into erysipelas. How to treat seborrheic dermatitis? 1. General treatment. Avoid excessive mental tension, regular life, keep enough sleep. In addition, pay attention to local hygiene, avoid scratching, and prevent infection. 2. Etiological treatment. The cause of this disease is not known so far, no special treatment. However, attention should be paid to reduce the stimulation of diet, emotions and other triggering factors. 3, symptomatic treatment. (1) Internal therapy. When itching is intense, sedatives such as antihistamines can be used, but also closed therapy, inflammation is obvious or secondary infection can be added antibiotics such as tetracycline or erythromycin. Supplementation of vitamin C, B6, B2 or vitamin B complex, niacinamide. (2) Topical therapy. To remove fat, sterilization, anti-inflammatory and antipruritic as the treatment. ① head lesions If there is no vesicular exudation, shampoo powder or selenium sulfide shampoo or 2% Caile shampoo; 2% water chlorine tincture for external use, 2 times a day; 5% sulfur cream mixed with corticosteroid cream for external use; containing antifungal, bacterial and hormonal drugs such as dermacare cream or compound sodium connate cream; 2% ketoconazole or 1% bifenbendazole cream for external use; infant seborrheic dermatitis scabs can be rubbed externally with vegetable oil, thick scabs, localized in pieces with Containing ichthyolipid, antibiotic ointment dressing, so that it softened off. ② smooth skin damage such as the face General external use of sulfur lotions or creams containing antibiotics. ③ those with vesicular ooze use 1:5000 potassium permanganate or 3% boric acid water wet compress and then treat as dermatitis. If you suspect that you are suffering from seborrheic dermatitis, you should visit a dermatologist in time and choose a reasonable and individualized plan for treatment under the guidance of an experienced doctor.