for the past 6 days, a 7-month-old infant has been receiving amoxicillin trihydrate to treat an ear infection. now the parents report redness in the diaper area and small, red patches on the infant's inner thighs and buttocks. after diagnosing candida albicans, the physician orders topical nystatin to be applied to the perineum four times daily. the nurse should focus her assessment on:
