Some dermatological diseases have clear causes, but there are still a considerable number of dermatological diseases whose causes have not yet been clarified. The many causes of skin diseases can generally be divided into the following categories: 1. congenital and hereditary factors. 2, age, gender, occupation, season, race, personal hygiene, psycho-spiritual, social factors, etc. 3, immune factors, the body’s own immune system to a variety of internal and external stimuli occur abnormally strong response, resulting in tissue damage and physiological dysfunction of the body. 4, biological factors, such as animal bites, stab wounds; plant-induced skin allergies; microorganisms such as bacteria, viruses, spirochetes, fungi caused by a variety of skin damage; parasites caused by skin damage. 5, physical and chemical factors, pressure, friction, temperature, radiation, sun exposure, taking certain drugs, eating certain foods, humidity, dryness, washing and scalding, scratching, etc. can cause skin disease, or make the original skin disease longer and symptoms aggravated, contact with many drugs, dyes, chemical materials and household daily use of hair dye, cosmetics, detergents, etc. can produce contact dermatitis. 6, lack of essential substances or metabolic disorders, endocrine disruption factors. 7, visceral diseases and infectious lesions. 8, Other such as malnutrition, overwork, malignant tumor, chemotherapy, improper care and poor diet are also the main causes of skin diseases.