What Causes Acne Acne can be caused by a variety of factors including excess sebum production on the skin, hormonal changes in the body, certain cosmetic products, improper hygiene, consumption of unhealthy fatty foods such as junk food and eating too much of pasteurized ('dead') milk, factory eggs and hormone-laden food, among others. If you do not have hormonal acne, you might be wondering why you have painful pimples even though: You wash your face twice a day with a natural sulfate-free cleanser. You eat only fresh, organic, pesticide-free and wholesome foods. You do not use cosmetic products or Continue Reading