Syphilis is divided into overt and latent syphilis. Latent syphilis, regardless of whether it is early or late stage, shows no symptoms at all and can only be confirmed by blood testing. The symptoms in the early stage are mainly those of overt syphilis, primarily manifestations of primary syphilis. The stages of primary, secondary, and tertiary syphilis begin with the appearance of a lesion at the site of infection, typically about 0.5 to 1 centimeter in diameter, with a hard, dark red nodule that feels like cartilage. The surface may have ulcers; it may be painless, or there may be no pain at all. Subsequently, nearby lymph nodes may become enlarged. This swelling of the lymph nodes is characterized by being painless, usually unilateral, with no redness or rupture. These are the clear symptoms of overt primary syphilis. If treated properly at this stage, recovery is generally rapid.