Beauty Experts Debunk 19 Skin-Care Myths

Like most things in life, acne is not always completely in one’s control. There are, however, some key tips we offer to help prevent breakouts:
Never go to bed with makeup on.
Check labels: when purchasing cosmetic and skincare products, always look for the terms “non-comedogenic,” “oil-free,” or “won’t clog pores.”
Avoid facial oils and hair products that contain oil.
Some acne spots are not actually acne but are post-inflammatory pigment changes from previous acne lesions or from picking at acne or pimples. Wear sunscreen with SPF 30+ daily, rain or shine, to prevent darkening of these spots.
There is some evidence that specific dietary changes may help reduce the risk of acne. For example, one meta-analysis of 14 observational studies that included nearly 80,000 children, adolescents, and young adults showed a link between dairy products and increased risk of acne. And some studies have linked high-glycemic-index foods (those that cause blood sugar levels to rise more quickly) and acne.
https://www.health.harvard.edu/blog/adult-acne-understanding-underlying-causes-and-banishing-breakouts-2019092117816