Seborrhoeic keratosis is a benign skin growth originating from keratinocytes.

Suggested approach to seborrhoeic keratosis OSCE station

Describing lesions

• Lesion
  • ‘There is a well-demarcated dark brown papule on the upper left part of the patient’s back.’
  • ‘This is 4mm in diameter and has a regular border, with a stuck-on appearance.’
  • ‘The lesion is raised, with a rough surface, but there are no secondary features.’
  • ‘This lesion is characteristic of a seborrhoeic keratosis.’

Differential diagnosis

• Melanoma
• Melanocytic naevus 
• Dermatofibroma
• Pigmented basal cell carcinoma
• Acanthosis nigricans

Management

• Reassurance
• Remove surgically if diagnostic uncertainty
• Remove using cryotherapy or curettage and cautery if cosmetic concerns
• Topical corticosteroids for itchy/irritated lesions

Questions

Dermatological skin exam OSCE station

1. Dermatological skin exam
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