Primary Syphilis:

• Painless, indurated chancre (ulcer) at the infection site (e.g., genital, oral, or anal).
• Regional lymphadenopathy (swollen lymph nodes).
• Rationale: The chancre is a hallmark of primary syphilis, often unnoticed due to its painlessness.

• Secondary Syphilis:
  • Constitutional symptoms: fever, malaise, headache, myalgias (muscle pain).
  • Skin rash (often on palms and soles), mucocutaneous lesions (e.g., condyloma lata).
  • Hepatitis, nephropathy, ocular changes (e.g., anterior uveitis), periostitis (bone inflammation).
  • Rationale: Secondary syphilis is systemic, affecting multiple organs.

• Tertiary Syphilis:
  • Neurosyphilis: Demyelination of posterior columns, dorsal roots, and ganglia, leading to:
    • Ataxia, foot drop, paresthesia, bladder disturbances, impotence, areflexia.
    • Loss of positional, deep-pain, and temperature sensations.
  • Cardiovascular syphilis: Aortic aneurysm, aortic regurgitation.
  • Gummas (soft, non-cancerous growths) in skin, bones, or liver.
  • Rationale: Tertiary syphilis is severe, often causing irreversible damage.

• Latent Syphilis:
  • No symptoms, but serologic evidence of infection.
  • Rationale: Latent syphilis is asymptomatic but can progress to tertiary syphilis if untreated.

• Oral Manifestations:
  • Mucous patch: Painless, silver-gray erosion with a red periphery.
  • T. pallidum DNA detected in oral swabs even without visible lesions (transmission risk unclear).
  • Rationale: Oral lesions can be a source of transmission, though not always visible.

Would you like more details on any specific stage or symptom?