You will notice dryness and perhaps some swelling after the cast is removed.  Your skin may also look dry or flaky. Your muscles may look smaller than when you put the cast on, which is normal.  Soak your arm/wrist in warm water for 5-10 minutes. Gently dry the skin with a towel.  Use a moisturizing cream on the wrist and arm to soften the skin. To reduce swelling, take ibuprofen or aspirin as recommended by your doctor. It can take some time before you’re able to return to your full routine. In particular, you may need to wait 1-2 months to resume light exercise, such as swimming or cardio. Vigorous activities such as sports may require waiting 3-6 months. Take care to prevent further injuries to your wrist. Braces can help prevent future wrist injuries. Just because your cast is off does not mean you are completely healed. It may take six months or longer to heal if the break was severe.  You may continue to have aches or stiffness for months or years after the initial break.  Your healing process is also affected by your age and overall health. Children and teens tend to heal faster than adults. Older adults and people with osteoporosis or osteoarthritis may not experience healing as fast or as fully.

TL;DR in Vietnamese:
Chăm sóc cánh tay và cổ tay sau khi tháo bột. Quay trở lại với các hoạt động bình thường theo lời khuyên của bác sĩ hoặc chuyên gia vật lý trị liệu. Nhớ rằng quá trình bình phục cần có thời gian.