I can now say, with rather high confidence, that my acne was caused by the consumption of (cow-)milk. I used to drink a lot of milk – and had a lot of acne. One and a half years ago I massively reduced my consumption of milk and milk-products, and my acne almost went away. I ceased to eat dairy and my acne went completely away. I reintroduced dairy, and my acne came back, pimples within 6 to 12 hours. It does not rise to the level to be considered proof, but for me, in my case, it is pretty clear.
Over the next months I will try Ghee ("clarified butter", which is almost free of both cow proteins and lactose, and contains almost only fatty acids) to see if this still contributes to my acne or not.
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