Zoon’s Balanitis: Diagnosis and Management. Well-defined, shiny, reddish-orange patch at the glans penis.

🔎 Introduction

Zoon’s balanitis, also known as plasma cell balanitis, is a chronic, benign inflammatory condition of the glans penis, typically seen in uncircumcised, middle-aged to elderly men.It is not sexually transmitted, but its appearance can mimic penile carcinoma in situ (erythroplasia of Queyrat), making accurate diagnosis essential.

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🧬 Pathophysiology

• Chronic irritation from retained smegma, moisture, and friction under the foreskin.
• Histology: dense plasma cell infiltrate in dermis, epidermal spongiosis, parakeratosis, and hemosiderin deposition.
• Chronic but non-malignant condition.

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👨‍⚕️ Clinical Features

• Site: Glans penis (may extend to inner foreskin).
• Lesion:
  • Single or multiple well-defined, shiny, reddish-orange patches.
  • “Lacquered” surface.
  • Characteristic cayenne pepper spots (punctate speckles due to hemosiderin).
• Symptoms:
  • Usually asymptomatic.
  • Occasionally, mild burning or irritation.
  • No ulceration, no scaling, no pain, no pruritus.

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🧪 Diagnosis

1. Clinical Examination

• Well-demarcated shiny erythematous patch on the glans in an uncircumcised man.

2. Investigations

• Biopsy (gold standard):
  • Essential to exclude erythroplasia of Queyrat (penile carcinoma in situ).
  • Findings: dense plasma cell infiltrate, epidermal thinning, and hemosiderin deposits.

3. Differential Diagnosis

• Zoon’s balanitis (plasma cell balanitis)
  • Chronic, reddish, shiny, well-demarcated patches on the glans.
  • Typically, painless, non-itchy, and seen in uncircumcised men.
• Erythroplasia of Queyrat (penile carcinoma in situ)
  • Velvety red plaque, usually painless.
  • Needs a biopsy to exclude malignancy.
• Candidal balanitis
  • Can present with erythematous patches/plaques, but usually associated with itching, burning, or whitish discharge.
• Lichen planus (genital)
  • Flat-topped violaceous or reddish lesions.
  • May be asymptomatic or mildly itchy.
• Fixed drug eruption
  • Recurrent red patches at the same site after drug exposure (e.g., NSAIDs, antibiotics).
  • Usually, sharply demarcated lesions.

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🏥 Management

1. Definitive Treatment

• Circumcision → curative ✅
  • Eliminates a moist environment under the foreskin.
  • Prevents recurrence.
  • Recommended by dermatology/urology guidelines.

2. Medical / Conservative Treatment

For patients refusing or awaiting circumcision:

• Topical corticosteroids (e.g., triamcinolone 0.1% cream, applied thinly once daily for 2–4 weeks).
  • ❌ Not for long-term use (risk of atrophy, recurrence common).
• Topical calcineurin inhibitors (preferred for long-term use):
  • Tacrolimus 0.03% ointment bid → safe for genital skin.
• Other options in refractory cases:
  • Imiquimod 5% cream.
  • Photodynamic therapy.
  • Carbon dioxide laser ablation.

3. Supportive Measures

• Gentle genital hygiene (avoid harsh soaps).
• Keep glans dry.
• Avoid irritants and trauma.
• Treat coexisting infections if present.

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🔁 Prognosis

• Chronic but benign.
• Medical therapy may induce remission, but has a high recurrence if the foreskin is retained.
• Circumcision is a definitive cure with negligible recurrence.

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📚 Key Exam Pearls

• ✅ Uncircumcised man + shiny red patch on glans + no pain/itch → Zoon’s balanitis.
• ✅ Biopsy required to rule out carcinoma in situ.
• ✅ Circumcision = definitive cure.
• ❌ Do not confuse with erythroplasia of Queyrat (precancerous).

⚡ Memory Tip: “Zoon is benign, Queyrat can kill.”

Would you like me to make a side-by-side exam table: Zoon’s balanitis vs. erythroplasia of Queyrat