The course content of Dermatovenereology includes a general theory of skin diseases and individual diseases. Dermatovenereology is the science of studying the occurrence, development rules, diagnosis and prevention principles of skin diseases and venereal diseases. There are 2000 thousands of dermatological diseases, and the description and definition of skin diseases depends on the description and understanding of skin lesions. This course is divided into two parts: the general introduction includes the structure and function of the skin, the etiology, manifestations, diagnosis, prevention and treatment of skin diseases and venereal diseases; the monographs include infectious skin diseases, allergic skin diseases, and erythematous scaly skin diseases, skin appendage disease, connective tissue disease, venereal disease, etc. This course is mainly suitable for undergraduates of clinical medicine. The textbook is the ninth edition of "Dermatology and Venereology" compiled by the National Health Commission. Combined with clinical cases, this course covers the main contents of Dermatovenereology that need to be mastered in undergraduate teaching. This course is a practical clinical course that enables students to master the knowledge and skills of diagnosis and treatment of common skin diseases and sexually transmitted diseases.