Test your diagnostic skills in our regular dermatology quiz. What is the cause of this cutaneous atrophy, which was not proceeded by any rash or oedema?
A 14-year-old girl presents with an area of marked cutaneous atrophy on her left lower abdomen that has developed over the last three months (Figure 1). Before this the skin was normal, with no preceding rash or oedema. She has been otherwise well and denies any trauma to the affected area.