Try this. Hair dryer could help to reduce that try it, stay in cool area.Good luck.
Followup. If you suspect you are having problems with the cast, don't hesitate to be seen. Itching does not usually indicate a problem with the cast. What ever you do, do not stick something down the cast to try to scratch the arm to relieve the itch. This can cause infection which can be quite advanced before it is detected under the cast.
Very common. since the skin continues to grow (and "dry out" Often a small rod (thin and NOT SHARP can be inserted in between the cast and the skin and "scratching" is possible that way!!! Takes s bit of practice but YOU CAN DO IT!' All else fails contact your Orthopedist for a cast change Hope this helps! Dr Z. Read more...