A 38-year-old woman complains of burning pain in her lips and angles of her mouth, their dryness. She has an 8-year- long history of diabetes mellitus. Objectively: the vermillion border is dry, congestively hyperemic, covered in scales of variable size. In the angles of the mouth there are fissures covered in white coating, the skin is macerated. What ointment should be prescribed for topical treatment in the given case?