Q. A 23-year-old woman has presented to the dermatology outpatient department with a 2-week history of an itchy rash on her arms and legs. She has a past medical history of seasonal allergies but takes no medications. On physical examination, the dermatologist has noted multiple, well-demarcated, erythematous plaques with silver scales. No lymphadenopathy is detected, and she is otherwise healthy. Lab investigations are also normal. What is the most likely diagnosis for this patient?