Trigeminal stage occurs usually after one to ten years after the initial infection. This period may be much longer. This period is characterized by the presence of gummmas affecting the skin, mucous membranes and bones. Tumors are known as chronic granulomas and represent the inability of the immune system to Eliminate microbial or microbial completely.
In the skin, the patches appear in the form of rash or ulcers in groups in the form of an arc or circle, and most often not accompanied by pain or itching and increase the area of spots at the center, but in the palm and heel skin rash is covered with a thick layer of crust, Circular and painless, and when these ulcers are stained lead to deformities of the body and the most affected areas are the face, head and legs.
In the bones, the pigmentation leads to the destruction of the bones of the skull and swelling in other bones such as the bone of the leg and turmeric and also leads to the destruction of the bones of the nose and gives the distinctive nose shape in patients with tertiary syphilis and be the passengers of the Persians.