You can start: “Endemic syphilis or Bejel disease is a chronic bacterial disease, sexually transmitted, characterized by painless damage to the skin and mucous membranes, lymph nodes and internal organs. Infection with this disease can occur even with the slightest contact with infected skin or mucous membrane of the patient "And regardless of this, the causative agent of the disease - gonococcus (Neisseria gonorrhoeae) remains in the body, in the case of an unhealthy immune system, it begins to multiply and infect healthy cells."