Syphilis is a sexually transmitted disease caused by the bacterium Treponema pallidum, with the disease course within two years referred to as early syphilis. Not all infected individuals display symptoms; asymptomatic syphilis is also known as latent syphilis. Symptomatic early syphilis primarily manifests as either primary or secondary syphilis. The main symptom of primary syphilis is a chancre, typically occurring as a clear-bordered ulcer in the genital area. It is flesh-colored and neither painful nor itchy. Several weeks after the chancre heals, secondary syphilis can develop, characterized by a rash that may resemble other skin conditions. Common manifestations include macules, papular macules, copper-red papules on hands and feet, flat condyloma, and syphilitic alopecia. Individuals who suspect they may have been exposed to syphilis should visit a hospital for a blood test to detect syphilis antibodies. Antibodies can usually be detected four weeks after infection, and a negative result three months later can rule out syphilis.