The hard chancre is the site where the spirochete enters the body and forms a local ulcer, which is the main manifestation of stage I syphilis. It appears 6 to 70 days after infection, initially on the male penis or female vulva, and as the disease intensifies, it gradually invades all organs of the body via lymphatic fluid and blood. The first stage of the disease is a small erythema, which rapidly develops into an inflammatory papule in a few days and expands until it becomes necrotic and forms a nodule, which is round or oval in shape and about 1-2 cm in diameter. The ulcer is smooth, flat, fish-colored, and painless, with a cartilage-like hardness to the touch, similar to the hardness of the tip of the nose, accompanied by a small amount of plasma discharge, containing syphilis spirochetes, and is extremely contagious. In men, it is mostly seen in the coronal sulcus, foreskin, tether, and glans area of the penis; in women, it is mostly seen in the cervix, labia majora and minora, and labia tether area. In addition, it can also be seen on the lips, tongue, fingers, breasts and other areas outside the genital area. The chancre can heal on its own in about 1 month without treatment. The main reason for this is that it is not only a good idea to have a good time, but also a good idea to have a good time.