It may not be less common in Asia, but the incidents of children in Australia with allergies is actually increasing.
In the childcare centre where I was working, we had children with all kinds of allergies and conditions.
Before heading to Australia, I did not hear of milk allergy or lactose intolerance, much less peanut, or shellfish allergies.
It was only in Australia, that I realised I had a condition commonly known as milk allergy.
Whenever I had more than a small serve of cappucino (Yes, the italian drink!), I realised I ended up getting a sore stomach and always had to go to the toilet, which last for almost a few hours, and sometimes a day. This is a common condition in many yellow skinned Asians as well, it seems.
Apparently a many Caucasians have peanut allergy, which is not a common condition in many yellow skinned Asians (i.e Chinese, Japanese, and Koreans) as peanut is an essential and common ingredient in our daily diet.
I also found out that in my family genetics, asthma and ezcema is also a common condition in my mother's side of the family. But because my father has strong genes, it has cut down the incidence of this condition, where both my brother and I do not have this condition.
However, it has turned out that many of my cousins though suffered from asthma and ezcema.
The link below explains ways to prevent allergies