Effects of coffee on acne

Though I am not a coffee addict (I only drink once a while), I enjoy drinking coffee. Especially with milk and sugar. But I noticed some side effects whenever I drink coffee, i.e. I will develop new acne bumps. Devin Mooers and Paula M both wrote articles on whether coffee triggers acne. There are quite a number of bads. Milk, Sugar, Mycotoxins, giving rise to hormonal imbalance, inhibition of glucose metabolism, etc.

There are also counter research being done to show that coffee may reduce acne as it reduces insulin which caffeine does the opposite. Does it mean that decaf coffee (Black and without sugar) is the way to go?