A 9-year-old boy came to OPD with well-controlled, moderately persistent asthma. He is taking sho-acting beta-agonists, daily inhaled steroids, and a leukotriene inhibitor. He is now complaining of white patches on his buccal mucosa. Next best step is?
HIV testing Rinse his mouth after use of inhaled medications Measurement of serum immunoglobulins Discontinuation of all his asthma medications