The characteristics of syphilis in male patients are not significantly different from those of women, with the main ones being chancre, enlarged lymph nodes, syphilis rash and systemic symptoms. 1. Chancre: Early syphilis can cause men to develop a chancre, which often appears on the external genitalia, with erythematous spots and pimples, followed by the formation of painless ulcers, etc., and is most common on the glans, penis, and prepuce ligament. 2. Swollen lymph nodes: Shortly after the appearance of the chancre, lymph nodes in the groin or nearby may become enlarged, but this is not accompanied by pain. 3. Syphilis rash: When syphilis reaches the second stage, a syphilis rash may appear, such as pimples, erythema and plaques all over the body, and flat warts may also appear. 4. Systemic Symptoms: Syphilis develops to a certain extent, but also cause fever, muscle pain, vision loss, bone syphilis, skin and mucous membrane damage, cardiovascular syphilis, neurosyphilis and other symptoms. There are many characteristics of syphilis, if you are worried about the infection of syphilis should be timely medical examination to clarify the diagnosis, do not self-diagnosis in order to avoid delaying the condition.