I've been experimenting lately with different forms of dairy. For as long as I can remember, cow's milk has given me issues with acne and other related skin/inf

I've been experimenting lately with different forms of dairy. For as long as I can remember, cow's milk has given me issues with acne and other related skin/inflammation issues. It's not lactose intolerance, since I get no stomach issues, and drinking lactose free milk is no better (even ghee still gives me problems). So then I tried sheep dairy. No such symptoms. Then I tried goat dairy -- but was not so lucky. The confounding factor here though is that both my cow and goat dairy were purchased at a regular grocery store and my sheep dairy was purchased by some guy selling direct at the farmer's market.