Dermatosis is a skin-related disease, and it is one of the common and frequently-occurring diseases that seriously affect people's health, such as leprosy, scabies, mycosis and bacterial skin infection. Dermatosis is the skin (including hair and nails) affected by internal and external factors, its shape, structure and function change, resulting in pathological process and corresponding clinical manifestations. The incidence of skin diseases is very high, most of which are mild and often do not affect health, but a few of them are serious and even life-threatening. It is recommended to go to a regular professional hospital for examination and treatment as soon as possible.