A 6-year-old boy presents to the clinic with a red and itchy rash on his arms and legs. The rash is present in his elbow creases, behind the knees and on his face. The patient's past medical history is significant for asthma, well controlled on salbutamol as required. On examination, the rash is eczematous with dry and scaly patches. The rash blanches. Capillary refill is 2 seconds. The rest of the physical examination is normal. What is the most appropriate next step?