How can TCM help with persistent skin rash and itchiness?

Thank you for posting a question. This is a complex question, which warrants proper questioning and examination by a qualified doctor. Any answer we give here will be difficult to answer your question with proper justice. Depending on your weight, 20mg of prednisolone is usually considered low dose and it is usually not expected to have these side effects especially when the course is so short as well. (perhaps you can consider to see a doctor to check if you have other medical problems) Most of your symptoms are non specific, and as such answers will probably be non specific as well.

What you’ve described is likely to be urticaria (or hives), induced by exercise/sweating/heat in this instance. It can occur at any age. The itchy rash tends to appear on your front, back, and chest, as you’ve described. I believe that the colloquial term for this is “feng mo”. Urticaria/hives is very common, and usually goes away on its own. If it persists after your exercise, you can see a doctor to prescribe anti-histamine tablets, which are very helpful in getting rid of the itch and rash.