## Secondary Syphilis: Most Common Systemic Manifestation **Key Point:** The maculopapular rash involving the palms and soles is the most common and characteristic manifestation of secondary syphilis, occurring in 75–100% of cases. ### Clinical Features of Secondary Syphilis | Manifestation | Frequency | Characteristics | |---|---|---| | Maculopapular rash (palms/soles) | 75–100% | Pathognomonic; involves entire body | | Generalized lymphadenopathy | 50–90% | Epitrochlear nodes are characteristic | | Condyloma lata | 5–15% | Moist, warty lesions in intertriginous areas | | Hepatosplenomegaly | 10–20% | Less common than rash | | Meningitis | 1–2% | Rare; part of neurosyphilis spectrum | | Iritis/uveitis | <1% | Uncommon in secondary stage | **High-Yield:** The **rash involving palms and soles is virtually pathognomonic for secondary syphilis** and appears in the majority of patients. This is a must-know for NEET PG. **Clinical Pearl:** Secondary syphilis is the most contagious stage of the disease. The rash is typically maculopapular, non-pruritic, and involves the entire body including the palms and soles — a distribution pattern that is highly characteristic and often leads to diagnosis. **Mnemonic:** **SYPHILIS in Secondary stage** — **S**kin rash (palms/soles), **Y**ellowish hepatitis, **P**apules, **H**epatosplenomegaly, **I**ritis, **L**ymphadenopath**y**, **I**ncontinentia pigmenti, **S**ore throat. ### Timeline - **Primary syphilis:** Chancre (3–90 days post-exposure) - **Secondary syphilis:** Rash and systemic symptoms (4–10 weeks after chancre appears) - **Latent syphilis:** Asymptomatic (variable duration) - **Tertiary syphilis:** Gummas, neurosyphilis, cardiovascular disease (years to decades later) [cite:Harrison 21e Ch 187]
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