While acne is a much more visible condition than most, it is important to remember that it is like most diseases, in which early detection can help to mitigate its impact. Bearing that in mind, we have taken the time to put together 10 of the most common causes for acne, so that you can be better informed and potentially avoid some (and only some) of its root causes.
Aqua (Water, Eau), Glycerin, Triethanolamine, Sodium Laureth Sulfate, Propylene Glycol, Isopropyl Alcohol, Salicylic Acid, Dimethicone, Aloe Barbadensis Leaf Juice, Chamomilla Recutita (Matricaria) Flower Extract, Thymus Vulgaris (Thyme) Leaf Extract, Sodium Hyaluronate, Carbomer, Parfum (Fragrance), Diazolidinyl Urea, Methylparaben, Propylparaben, Benzyl Benzoate, Benzyl Salicylate, Eugenol, Linalool.
48. Clean your makeup brushes every two weeks or so. The amount of product and bacteria build up that happens within two weeks is frightening, and the longer you wait to clean the brushes the longer you’re putting the bacteria right on your skin, causing breakouts. Use warm water and a mild anti-bacterial soap to clean your brushes, laying flat to dry to avoid any warping that can happen.
11. You need to clean your phone, too. If you're seeing pimples on your cheeks or anywhere near the area where you hold your phone, they may be from those hour-long convos with your crush. Your phone picks up lots of dirt and bacteria (from your hands, your bag, the kitchen counter), which can then get transferred to your face when you're chatting on the phone. Wipe your screen with an anti-bacterial wipe often to get rid of dirt and germs.
Another study focused in on dairy. In 2005, an article in the Journal of the American Academy of Dermatology took on milk and milk products. By examining the diets of 47,355 women, researchers observed a significant connection between milk and dairy intake and breakouts. Some researchers believe this is caused by high levels of hormones found in our milk products. Much of the milk consumed is produced by pregnant cows, who pump out progesterone, IGF-1, and other compounds that are then passed into the milk. We may also be subject to Bovine Growth Hormone (BGH). These hormones can signal the oil glands to start producing more sebum, which can affect acne. Unfortunately, switching to organic milk doesn’t seem to make a difference, and neither do skim milk options. In fact, skim milk has been observed to worsen the skin, which researches have attributed to lower levels of estrogen and different processing activities. Milk is also known to contain a number of vitamins, some good and some not so beneficial to your skin. Research has shown a correlation between acne and vitamin A in milk. 
There are simple things you can do on your own to help prevent adult acne and keep it from getting worse. First, wash your skin once or twice a day with a non-drying, non-comedogenic cleanser that won't clog your pores. Look for cosmetic products labeled oil-free, non-comedogenic and non-acnegenic (unlikely to cause acne breakouts). In addition, avoid heavy skin creams or hair products which may aggravate your skin condition.

Drugs: Some medications may cause or worsen acne, such as those containing iodides, bromides, or oral or injected steroids (either the medically prescribed prednisone [Deltasone, Orasone, Prednicen-M, Liquid Pred] or the steroids that bodybuilders or athletes sometimes take). Other drugs that can cause or aggravate acne are anticonvulsant medications and lithium (Eskalith, Lithobid). Most cases of acne, however, are not drug related.
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