MSRA-0324

A 25-year-old man comes to his General Practitioner complaining of an itchy rash on both his wrists that has been present for 1 week. Upon examination, the doctor notes small purplish papules on the flexural aspect of both wrists with a flat top and small white lines on the surface. The patient also has areas of hyperpigmentation on the inner aspect of his elbows. What is the most probable diagnosis?