Might consider just using the dexamathason for a
I'm assuming you do not wear contacts. If you do the contacts are the cause 99% of
There are many things that you could be allergic to that could cause this including cosmetics, hair coloring, nail polish, food allergies, perfumes, etc.
If you get no relief consider seeing a cornea/external disease ophthalmologist. You can use the Find An Eye MD feature at www.aao.org to find one near you.