Herpes is not usually present on the mouth during syphilis. Herpes in the mouth is mostly caused by herpes simplex virus infection, whereas syphilis is caused by Treponema pallidum (TP) infection, which does not usually show herpes lesions in the mouth.
Syphilis is generally categorized into Stage I, Stage II, and Stage III according to the course of the disease. In stage I syphilis, the chancre is present, mostly in the external genital area. In stage 2, there may be skin and mucosal lesions, such as syphilitic rashes, flat warts, and syphilitic alopecia, as well as multiple lesions, such as osteoarticular and ocular lesions. The third stage can have nodular syphilitic rash, which occurs in the limbs, head, face, trunk and other parts of the body.
When a patient develops a viral infection of herpes simplex, herpes may appear in the mouth, which is not directly related to whether or not the patient is in the syphilis stage.
For patients with syphilis, if the oral mucosa and other parts of the skin lesions change, it is recommended to go to a regular hospital in time for examination and treatment under the guidance of a professional doctor.