“Transforming yang into qi，and yin into entities” is an important part of the theory of yin and yang in traditional Chinese medicine.It plays an important role in the occurrence，development，diagnosis and treatment of the dermatosis.Insufficient yang qi with too much yin qi is one of the important factors of the development of dermatosis.Therefore，warming yang to expel evil factors and supplementing yang and repressing yin are important treatments for treating dermatosis.