Yes you are right....I have been in Qatar for past 18 years....eating frozen chicken like Sadia, Doux, etc cause skin allergies, body swelling, etc....
However, if you take the fresh chicken or from the poultry directly then it is safe....

Unfortunately, due to this I can't eat meat in restaurants as they server frozen even in the 5 Stars.....

I eat only at Al Tazaj as they server fresh chicken but only their Chicken combo one, others are frozen again....