Wait...I don't think that facehugger melted its way through, though, because if it did then the ones in Aliens would have done the same whenever their victims used their arms to hold them at bay...
Additionally, if it had exuded acid to break through the helmet, then his face would have been a lovely piece of work, too...they might just break through using brute force.
As for a pred's mask, I think that is one reason why the yautja may wear masks in the first place: to keep their sacred prey from spawning an abomination which could prove to be too deadly for even the yautja to handle.
And thus I clothe my naked villainy
With old odd ends stolen forth from holy writ
And seem a saint when most I play the devil.