The incidence of penile tuberculosis accounts for 4% of the incidence of urogenital tuberculosis. The disease can occur on the surface of the penis skin, in the penis cavernous body, or in the penis urethra. Mycobacterium tuberculosis can be transmitted from urinary tract tuberculosis, or through sexual intercourse or contact with contaminated clothes. There is still controversy as to whether it is transmitted through blood. After the onset of the disease, a slightly red tuberculous nodule appears on the glans penis, the frenulum of the penis, or the external opening of the urethra. Later, the center of the nodule ulcerates and becomes an ulcer. The surrounding tissue hardens, and caseous necrotic tissue appears at the bottom of the ulcer. As the ulcer continues to grow, the inguinal lymph nodes swell.