I get Milia frequently, and have found its from anything with mineral oil in it. I use U/D and MAC paintpots, and havent noticed that they increase from that. I did notice I got a few right after I started using MAC liquid M/U remover. I stopped using it and havent gotten any more in awhile.
Korres products are PERFECTION for moisturizers, and they do not use mineral oils or any other synthetic products.