Welcome to Health Care Magic.
I have gone through your query.
The problem you have mentioned ( Dermtographism) is due to Physical Urticaria
. Attacks are usually due to scratching, itching,or firm pressure on skin.
Irony is that you dont know which agent causes it . Therefore You need not worry about working in a glass fiber industry, as the glass fibers will not directly cause you urticaria unless you handle the glass directly and if that causes pressure.
YOu dont need specific treatment unless it is troublesome.
Using antihistaminis like fexofenadine
, loratidin, dimenhydramine, levocetrizine etc., will help you.
But some of these might cause you drowsiness
. So i recommend you to take non drowsy preparations like fexofenadine, desloratidine.
Wish you all the very best for your job