In one 2018 meta-analysis published in the Journal of the European Academy of Dermatology and Venereolog, researchers found that milk consumption—particularly skim milk, which is higher in sugar than whole milk—was associated with a greater risk of acne. Beyond the higher sugar content, scientists believe that proteins and hormones found in milk products, including IGF-1, may play a role in acne flare-ups by increasing oil production and inflammation.
Oral isotretinoin is very effective. But because of its potential side effects, doctors need to closely monitor anyone they treat with this drug. Potential side effects include ulcerative colitis, an increased risk of depression and suicide, and severe birth defects. In fact, isotretinoin carries such serious risk of side effects that all people receiving isotretinoin must participate in a Food and Drug Administration-approved risk management program.
Antibiotics. These work by killing excess skin bacteria and reducing redness. For the first few months of treatment, you may use both a retinoid and an antibiotic, with the antibiotic applied in the morning and the retinoid in the evening. The antibiotics are often combined with benzoyl peroxide to reduce the likelihood of developing antibiotic resistance. Examples include clindamycin with benzoyl peroxide (Benzaclin, Duac, Acanya) and erythromycin with benzoyl peroxide (Benzamycin). Topical antibiotics alone aren't recommended.