Causes of seborrheic dermatitis

Seborrheic dermatitis clinical more common, good hair in the head, face and chest and back, such as sebaceous gland secretion of exuberant parts, can be accompanied by varying degrees of itching. Normal skin there are Staphylococcus, Streptococcus, Pityrosporum, Propionibacterium acnes and other normal flora, they are in a non-pathogenic balance state, when in the internal and external factors, sebaceous gland secretion increased, this balance state is destroyed, can be caused by the following two aspects. 1. Pityrosporum and other large growth and reproduction and invasion of the skin. 2. Increased sebum in the role of Propionibacterium acne, decomposition of free fatty acids, stimulate skin inflammation. Mental stress, too greasy diet, B vitamin deficiency, alcohol and other factors can affect the occurrence and development of this disease to varying degrees.