[Dermatitis artefacta presenting as photodermatosis].

Dermatitis artefacta is a form of a self-injury due to psychiatric disorders or internal conflicts. Delayed diagnosis often leads to unnecessary treatments. A 17-year old girl was referred with a putative photodermatosis presenting with erosions on an erythematous base on the face and forearms. The unusual rapid onset of new lesions following phototesting and in particular a reaction induced after a simulated light exposure substantiated the diagnosis of dermatitis artefacta. Faced with the diagnosed the patient admitted she had induced the lesions and was referred for psychiatric care.