That kind of happened to me and after doing some reading, I think I had overexfoliated and thus damaged my skin's acid mantle/harmed its moisture barrier. Angry irritated dry skin, breakouts all over, both little whiteheads and ugly cystic buggers.
I stopped all exfoliants, used a gentle cleanser (non-foaming, creamy) morning and night, a mild but not too occlusive moisturiser, occasionally some oil (marula, argan or such), and some LRP Cicaplast Pro Recovery here and there to soothe the angry. Took about two weeks to feel and look much better.
I would look at the newest things and the harshest things in your current routine - the BM powder and the Ren bioretinoid (how strong is it?). In the past I had terrible reactions to powder foundation and it sounds like others have too, so that might be it if you haven't used before (esp the bismuth). In my case, it turned out my skin likes glycolic acids, but hates lactic except in v small amounts v occasionally. If you don't feel like the retinoid is doing anything and your skin is irritated, omit it for a while and see what happens.
There's lots of advice online about using oils containing fatty acids and testing ph (!) and all that jazz, but I found just paring things down to simple and calming for a while, then slowly adding back in (after 2-3 weeks) alternating exfoliant and retinoid helped. And I added them back in 1x/2x per week, rather than immediately using one or other product every night.
I recently got the new Nars foundation and it's buildable medium to full coverage that looks pretty natural, so it might be a good option for disguising the stuff that you're worried about until you can get back to the lighter YSL one again. But sadly, it's not cheap. However, if you're near a Space NK, they'll almost certainly give you a sample.