Secondary Syphilis
Secondary syphilis represents the systemic stage of Treponema pallidum infection, occurring weeks to months after the primary chancre. It is often referred to as “The Great Imitator” due to its varied cutaneous presentations.
Key Clinical Presentations
- Diffuse Eruption: Typically a symmetric, maculopapular rash. A hallmark feature is involvement of the palms and soles.
- Condylomata Lata: Smooth, flat, moist, wart-like, highly infectious lesions found in intertriginous areas.
- Constitutional Symptoms: Often accompanied by generalized lymphadenopathy, fever, malaise, and pharyngitis.
- Alopecia: “Moth-eaten” appearance of patchy scalp hair loss.
Diagnostic Approach
| Test Type | Examples | Note |
|---|---|---|
| Non-treponemal | RPR, VDRL | Useful for screening and monitoring treatment response. |
| Treponemal | FTA-ABS, TP-PA | Confirmatory; usually remain positive for life. |
High-Yield Exam Pearl:
- Differential for Palms/Soles: If you see a rash on the palms and soles, always include Secondary Syphilis, Rocky Mountain Spotted Fever, and Coxsackievirus (Hand-Foot-Mouth Disease) in your differential.
- Jarisch-Herxheimer Reaction: An acute, febrile, systemic reaction that can occur within hours of starting antibiotic treatment (due to rapid spirochete lysis). It is not an allergic reaction to penicillin.