Dermatology · UKMLA & AKT
Dermatofibroma
A free high-yield preview for the UKMLA Applied Knowledge Test. Below are the key points to recognise dermatofibroma — the full SA Note notes add investigations, management, complications and 10 practice questions.
Key high-yield points
- Site - most commonly lower limbs (anterior shin); also trunk and upper limbs
- Morphology - firm, well-circumscribed, dome-shaped dermal nodule, 0.5-1.5 cm
- Colour - skin-coloured, pink, or light to dark brown
- Dimple (Fitzpatrick) sign - pathognomonic: lateral pinching causes central inward puckering due to fibrous tethering to overlying epidermis
- Symptoms - usually asymptomatic; occasionally mildly pruritic or tender
- Demographics - young to middle-aged adults; female predominance; multiple lesions (≥5) associated with immunosuppression (HIV, SLE)
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