OP you said this about my post:
See I really take offensive to that. I didn't start this thread to judge anyone who wears make-up or who decides not to wear make-up. It's personal choice.
But you have judged people that do by saying that they are wearing a mask. I don't wear so much make-up that if I went without it I would be completely unrecognisable.
I wish to clarify what I said. I called wearing make-up "wearing a mask." I did not mean "a mask" in the sense of something that renders someone unrecognisable. I meant "a mask" in the sense that disguises what someone truly looks like.
I wear make-up every day. Whether I am ill or well. Whether I am going out to a party or staying in all day. If I am going out to an exercise class first thing and likely to sweat it all off. If I were not going to see another human being for the whole day.
I feel deeply uncomfortable without it - I look as if I have just been dug up. However, as I do not wear mascara, or eye shadow, most people think I don't wear make-up at all. To me, make up is to make me look OK, healthy, a tad younger. Not to make me look like someone with fab make up.
I would still call it a mask. Because it masks the haggard horror that is my reality. 
This is why I cannot comprehend why someone would stroll off to the station without make up on (like my sister used to) then sit and trowel it on in front of everyone on the train. If you consider that you look rough enough to need that much make up then IMO you need to apply it before you see anyone, even fellow commuters.
However, having read the OP again, any make-up is likely to have disappeared after a long-haul flight so I do not think these rules [of mine] apply in those circumstances.
Apologies OP, I did not mean to offend you.