Benign nodule caused by proliferation of fibroblasts, commonly triggered by trauma

Aetiology

• Multiple dermatofibromas are sometimes found in immune conditions such as HIV and SLE

Clinical presentation

• Unchanging firm lesion, skin-coloured or brownish
• Occasionally itchy
• A dimple or central depression (known as the ‘dimple sign’) when the lesion is squeezed or pinched

Investigations

• Usually a clinical diagnosis
• Dermoscopy can be used to confirm diagnosis - scar-like white centre
• Biopsy if still uncertain

Management

• Completely benign - reassure, no excision required