Solids non-fat has traditionally been used to make skim milk, Greek yogurts, some cheeses, as well as things like protein powder.

Source: https://www.chroniclejournal.com/news/national/why-doesnt-canada-make-its-own-baby-formula-when-we-have-the-raw-ingredients/article_35dd3d8e-9e06-5819-bc91-1bf850162b9a.html

There is actually a pretty substantial body of acne and dairy consumption, especially itself — whole, low-fat and skim milk included.

Source: https://www.huffingtonpost.co.uk/entry/worst-food-for-your-skin-dermatologists_uk_645cbd19e4b094269bb25840