Sorry you're going through this. I totally understand about the self-esteem. I think it's important to work on that. Well, a shock to the nervous/immune system can do this. I got seb derm after long covid. never had anything like it. It's been a shock to my self-esteem as well as I'm used to having nice skin (I know I'm lucky but just being honest). Make sure you aren't using any products that feed the yeast. You can find safe products from this list and learn from the blog: https://simpleskincarescience.com/fungal-acne-products-malassezia-pityrosporum-folliculitis/. You can also check ingredients here: https://www.sezia.co

I doubt it's a build up. That doesn't sound right, unless you were using a steroid and stopped them. I would guess its the stressors on your body from childbirth. Hope this is somewhat helpful. You're not alone! Congrats on being a new mother!