Codes

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

• Tinea corporis – Will have positive potassium hydroxide (KOH) examination.
• Intertrigo with secondary bacterial infection.
• Candidiasis – "Beefy" red erythema or satellite pustules prompt concern for candidiasis.
• Erythrasma – With "coral red" fluorescence by Wood's lamp examination.
• Seborrheic dermatitis – Can be difficult to exclude, even histologically.
• Hailey-Hailey disease (benign familial pemphigus) – An inherited acantholytic disorder with characteristic histologic findings. Clinically, plaques are more moist and fissuring is often more apparent.
• Darier disease (keratosis follicularis) – An inherited acantholytic disorder with characteristic histologic findings; unusual in the genital area.
• Subcorneal pustular dermatosis (Sneddon-Wilkinson disease) – Annular plaques with pustules along the border and often clear center.
• Impetigo herpetiformis – Occurs during pregnancy; pustules occur at the margins of the lesions.
• Genital lichen sclerosus – Atrophic, blue-white plaques.

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Therapy

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References

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