MSRA-0244

A 25-year-old man presents to his General Practitioner with a 1-week history of an itchy rash on the inner aspect of his elbows on either side. He states that this came on suddenly and that he has had similar episodes in the past, the first of which occurred when he was around seven years old. He claims to only suffer from generally dry skin and asthma, which he controls with emollient creams and inhalers, respectively.
Given the likely diagnosis, which of the following is the best next step?