Casting and desperate itching

Hi, I have a little nephew with a cast in his arm. It is itching him a lot and I know we should not place baby powder, lotion, liquid, or any instrument inside the cast to help him scratch. I have used the hair dryer in the cold setting and I have put a cloth of cotton on the edge of the cast, but nothing helps. Do you have any good suggestions? I appreciate your prompt advice.
What did the treating physician recommend in the aftercare instructions?

Itching inside a CastItching is a common yet frustrating problem for a person with a cast, especially during hot weather. Even if you can reach the itchy area, do not scratch the skin inside the cast. Because the skin is in a hot, moist environment, it is susceptible to damage. Scratching is more likely to injure the skin than under normal circumstances and increase the itchiness. Do not put anything in the cast, especially to itch. Using objects or toys to scratch is a major concern with young children. A lodged object in a child's cast can cause a pressure sore in addition to a possible infection. Do not apply powders or deodorant to your itchy skin. This will only increase the itchiness. If surgery was performed and there is an incision, consult your doctor for pain medication or medication to reduce itching. Using a hairdryer (with the temperature setting on cold) over the area may also reduce the itchiness, whether or not an incision is there. You may use over-the-counter antihistamines if the itching is severe. If the itching persists, contact your doctor.OFC | The Orthopedic & Fracture Clinic, OregonI would also advise calling the Ortho provider. We wish you well

Wearing a Cast? Be Careful How You Scratch That Itch - US NewsWateproof Ice pack applied to outside cast seems to help most.