http://www.ovarian-cysts-pcos.com/news15-pcos-acne.html

Consumption of milk can contribute to acne.  
In a study of 6,500 adolescents, a link between milk consumption and acne was shown. Other

problematic foods included milk-based instant breakfast drinks, sherbet, cottage cheese and cream

cheese.

Most milk comes from pregnant cows, which have high levels of hormones that can stimulate acne

production.