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secondary syphilis palmar rash annular scaling

The diagnosis is clear. Here is a comprehensive analysis:

Diagnosis: Secondary Syphilis

The three images together form the classic triad of secondary syphilis:

Finding-by-Finding Analysis

ImageLesionSignificance
AxillaHyperpigmented, velvety plaqueSyphilitic papulosquamous lesion in intertriginous area; can also be condylomata lata in folds
BackOval/annular erythematous plaque with peripheral scale (Biett's collarette)Papulosquamous syphilid — characteristic "collarette of scale" on trunk
PalmDesquamating, peeling erythematous lesions crossing palmar creasesPathognomonic palmar syphilid — present in ~75% of secondary syphilis cases

Why This Is Secondary Syphilis

  • Palmar involvement crossing the creases with copper-colored macules/desquamation is highly specific for secondary syphilis — very few other conditions cause this pattern
  • Truncal oval plaques with collarette scaling (Biett's collarette) is characteristic of syphilid eruptions
  • Intertriginous hyperpigmented lesion (axilla) fits the papulosquamous/lichenoid syphilid pattern
  • The lesions are distributed on trunk + extremities + flexural folds — the classic disseminated pattern of Treponema pallidum bacteremia
"Erythematous to copper-colored round papules or macules, well demarcated and sometimes with an annular scale, are present on the palms and soles in nearly 75% of cases and classically cross the palmar creases." — Fitzpatrick's Dermatology, Chapter 170

Reference Images from Literature

Secondary syphilis palmar rash
Palmar syphilid — copper-colored papules with Biett's collarette
Secondary syphilis trunk rash

Differential Diagnoses to Exclude

ConditionAgainst it
Pityriasis roseaNo herald patch; palmar involvement unusual
Tinea corporisWouldn't explain palmar peeling
PsoriasisLacks silvery scale; palmar pattern different
Drug eruptionNo palmar collarette crossing creases

Recommended Workup

  1. RPR / VDRL (non-treponemal screening)
  2. TPHA or FTA-ABS (confirmatory treponemal test)
  3. HIV testing (co-infection is common)
  4. Partner notification and contact tracing

Treatment

  • Benzathine penicillin G 2.4 million units IM — single dose (if no neurosyphilis)
  • Penicillin-allergic: Doxycycline 100 mg BD × 14 days
  • Monitor RPR titres at 3, 6, 12 months for treatment response
Note: This is a notifiable STI — sexual contacts need evaluation and treatment.
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