On one of your shows a few weeks ago you mentioned that your son had the above problem, many years ago I suffered the same problem, in my case it was feet.
After many fruitless visits to my medical centre no change, however I did get a doctor at another visit who took a greater interest and it proved to be the miracle required the product name is ANHYDROLFORTE
It is now approximately 45 years since I applied this product (roll on applicator) and to this day I have never had any recurrence.
Finally, my cousin also suffered from the same condition (HANDS), I gave her the product as I no longer needed it and guess what, it also cured her problem.
Hope the above is helpful and cures his problem.
Oh, by the way... my wife and I also like the show.
Update, Anhydrol forte can be obtained via Google cost 3.19 for 60ml