In the early stages of syphilis in men, the main symptoms are chancre symptoms and swollen lymph nodes in the groin. 1. Chancre: When a man is infected with syphilis, small red dots appear on the genital area, such as the penis, glans and testicles, similar to the symptoms of allergies. As the disease progresses, the small red dots will gradually become bigger and bigger, slowly forming ulcers the size of copper coins, without obvious pain. In addition to the reproductive organs, chancre may also occur in other areas, such as the perianal area. 2. Swollen lymph nodes in the groin: one to two weeks after the onset of the chancre, the lymph nodes in the groin or around the affected area tend to become enlarged, but not painful. When men experience these symptoms, it is recommended that they go to a hospital for examination and diagnosis in a timely manner, and that they undergo appropriate treatment under the guidance of a doctor.