Syphilis is a classic infection transmitted mainly through unsafe sex. The causative agent is the spirochete Treponema pallidum. The clinical picture of syphilis is very diverse and rich depending on each stage of the disease, notably swollen lymph nodes and lesions on the external genitalia.

Syphilis is one of the most dangerous sexually transmitted diseases. If not treated promptly, it can invade the patient's internal organs, skin, cardiovascular system, and central nervous system, causing many complications, even lifelong disability or death.