Dermatologic venereal disease is a general term for both dermatologic and venereal diseases. Among them, dermatologic diseases are all types of diseases that occur in the skin and skin appendages. It should be noted that dermatologic diseases can involve only local skin, but also systemic diseases involving the skin and other systemic organs, and can be the skin manifestations of certain systemic diseases. Therefore, when a skin disease occurs, it is not possible to obtain satisfactory results with a single topical medication, but requires a holistic approach to the cause of the disease. STD is the abbreviation for sexually transmitted disease, which is a group of infectious diseases that can be transmitted through sexual contact, similar sexual behavior and indirect contact. It is important to note that STDs do not only involve the genitourinary organs at the site of sexual contact, but can also invade the lymph nodes belonging to the genitourinary organs through the lymphatic system, and even invade vital organs and organs in various other parts of the body through blood-borne transmission. In addition to syphilis, gonorrhea, condyloma acuminatum, non-gonococcal urethritis, genital herpes, soft chancre, lymphogranuloma venereum and AIDS, STDs in a broad sense also include genital candidiasis, vaginal trichomoniasis, bacterial vaginosis, etc. In addition, infectious skin diseases such as pubic lice, scabies, infectious molluscum contagiosum, hepatitis B, ringworm, etc. can also be transmitted through the lymph nodes. These seemingly common diseases can also be transmitted through sexual contact and also belong to the category of STDs.