Hormonal fluctuations and an imbalance of estrogen and testosterone levels have proven to be a direct cause of acne. For this reason, many experience an onslaught of breakouts during puberty and pregnancy. The brain releases a GnRH hormone when an adolescent begins puberty, which in turn signals the pituitary gland to release two additional androgens. Androgens make the sebaceous glands produce more sebum, causing it to occupy too much space within the pore and preventing the full expulsion of dead skin cells and debris. Fluctuations in hormones also cause many women to experience acne during pregnancy and a worsening of breakouts during menstrual cycles.
How to Handle It: If you've tried the usual anti-acne ingredients, like salicylic acid and benzoyl peroxide (which, we should warn you, rarely work for this), you should consider paying your dermatologist a visit. "You may need a cortisone injection or an oral medication, like an antibiotic, in addition to topical formulas," says Zeichner. He's also a fan of a prescription topical medication called Epiduo Forte Gel, since, he says, it's been shown to be effective at controlling severe acne without the help of oral treatments.
Diet. Studies indicate that certain dietary factors, including skim milk and carbohydrate-rich foods — such as bread, bagels and chips — may worsen acne. Chocolate has long been suspected of making acne worse. A small study of 14 men with acne showed that eating chocolate was related to a worsening of symptoms. Further study is needed to examine why this happens and whether people with acne would benefit from following specific dietary restrictions.