Widespread Rash

David Kowalski is a 38-year-old male presenting with chronic scaling plaques on elbows, knees, and scalp. I'm 38 years old, and I've had this skin problem for about 3 years now. It started as small red patches on both my elbows. I thought it was just dry skin, so I used a lot of moisturizer, but it never went away. Your task is to take a focused history from this patient.