Final answer:
The nurse should suggest applying an adhesive remover to dissolve the adhesive and soften it, reducing discomfort for the patient.
Step-by-step explanation:
If the patient reports that removing the skin barrier is sometimes painful during the ostomy pouching system replacement, the nurse should suggest applying an adhesive remover to dissolve the adhesive. This will soften the adhesive and make it easier to remove, reducing discomfort for the patient. Options A and B are not recommended, as removing the skin barrier quickly or using a hairdryer on a cool setting may increase the pain and discomfort. Option D, using a moisturizing lotion, may not effectively dissolve the adhesive and may not provide sufficient relief for the patient.