I bought a pair of prescription eyeglasses two weeks ago, but my face got acne after several days, guys told me i was allergic to metal frames, I should change for other frames, so what kind of frames should I choose?

You can try titanium or stainless steel frame, thay can do your favor, and if your like plastic frame, it is a good choice either!

I think plastic eyeglasses frames are your best choice!