Could it be okay to apply testosterone gel to the face?

Yes. but... Technically, yes, you may apply testosterone gel to the face, but it is not clinically advisable to put it in the exposed surface owing to its contaminated effects onto others in contact including females, children, and other men. So, it is not okay to do so. But I am curious to wonder why you would think of applying it to the face instead of the tested and recommended areas. Talk with Doc timely.