Are there any sources for a leniency for a woman to wear make-up when her Mikveh night falls on a Friday considering it is not technically a Chatziza? Suppose the woman feels uncomfortable without make-up.
Rabbi Dovid Miller, a student of R' Aharon Lichtenstein zt'l and a faculty member of YU's Gruss Kollel in Israel, has a series of four mp3s on yutorah.org on dinai tvilah veChatzitza. In one of those, he mentions a case of Shabbos Sheva Brachos in a Charedi culture where -- well this isn't my world, ... but in their world, if a woman isn't PAINTED, people would notice. He said this woman got a heter to wear non-chatzitzah makeup to the Friday night Sheva Brachos and then go to the Mikvah afterwards.
(I should add in Rabbi Miller's case, not wearing makeup would essentially be broadcasting that the bride was a Nida during the wedding, which could be much more embarrassing than simply someone who always likes to be seen in makeup ... but that's a shade-of-gray question for a posek to address.)
So certain types of makeup, in certain circumstances, could be permissible in theory. You'd really have to consult an expert posek on those details, though.