Benign & Pigmented Lesions

Key points

• Seborrhoeic keratosis: 'stuck-on' waxy plaques — benign; sudden eruptive multiple lesions = Leser-Trélat sign (internal malignancy, esp. gastric).
• Dermatofibroma: firm dermal nodule, 'dimple sign' on pinching — legs of women.
• Skin tags (acrochordons) and Campbell de Morgan spots (cherry angiomas) are benign.
• Pyogenic granuloma: rapidly growing friable red nodule that bleeds easily — often after trauma/in pregnancy.
• Epidermoid cyst: firm cyst with central punctum.