I've astonished myself by actually deciding that this movie looks pretty cool. And I've never even liked Captain America.
Maybe it's actually a mask here, too, and he's just wearing a mask over the mask to heighten the suspense and anticipation of the removal of the outermost mask to reveal the innermost mask; that is, the intermediary mask covering his actual face, which I guess is sort of like a mask of skin covering his actual skull, which is most likely not all that red in reality.