Quick Questions about nose-masks (for those who use them)

I've always found that a really weird trend too. Like the sims have some kind of cold or something, with these bright red noses. I've seen ear blush as well like that, which I do use on some of my aliens for colouring.
I don't use nose masks either, but some of the Simblr's I follow blend them really well, and until I see a CC list, never have known they've actually used one.