Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Herpes Simplex ?
    ### Response:
    Herpes is an infection that is caused by a herpes simplex virus (HSV). Oral herpes causes cold sores around the mouth or face. Genital herpes affects the genitals, buttocks or anal area. Genital herpes is a sexually transmitted disease (STD). It affects the genitals, buttocks or anal area.
    