Cow's milk causes acne me (i stopped drink) but buttermilk not (from a milkman near to me). Can you explain why?? And can I take goat yogurt??

Milk acne. Goat's milk or yogurt is different from Cow's milk so it is possible that you can use it without the sensitivity that you get from the cow's milk. If it is true acne, that is not an allergic reaction, but a sensitivity.