Adult acne is remarkably common, affecting roughly half of women in their 20s and about a quarter of women in their 40s. Men get it too, though at lower rates. The causes overlap with teenage acne in some ways, but several triggers are unique to adult life: shifting hormones, chronic stress, skincare products that quietly clog pores, medications, and dietary patterns. Understanding which factors are driving your breakouts is the first step toward clearing them up.
Why Adults Still Get Acne
Acne forms through four connected processes: excess oil production, changes in the oil’s composition, clogged pores from a buildup of skin cells, and inflammation driven by bacteria. In teenagers, the flood of new hormones at puberty kicks all of this into gear. In adults, the same processes are at work, but they’re set off by different triggers, and they tend to show up in different places. Adult acne concentrates along the jawline, chin, and lower cheeks more often than the forehead-and-nose pattern common in teens.
A large study in the Journal of the American Academy of Dermatology found that acne persists well beyond adolescence. Among women aged 30 to 39, 35% still had clinical acne. Among men in the same age group, 20% did. Even past 50, about 15% of women and 7% of men reported active breakouts. For some, this is acne that never fully resolved from their teen years. For others, it appears for the first time in their 30s or 40s.
Hormones Are the Primary Driver
Androgens, a group of hormones that includes testosterone, are the single biggest factor behind adult acne. Your skin’s oil glands have androgen receptors, and when those receptors are activated, the glands enlarge and produce more sebum (the waxy oil that coats your skin). But it’s not just the amount of oil that matters. Androgens also change the composition of sebum, making it more likely to irritate follicle walls and feed acne-causing bacteria.
What makes this especially tricky is that your skin can amplify androgen signals on its own. Oil glands contain enzymes that convert weaker hormones into more potent forms right at the skin’s surface. This means you can have normal hormone levels on a blood test and still experience hormonally driven breakouts, because the conversion is happening locally in your skin.
For women, hormonal acne often flares in a predictable pattern tied to the menstrual cycle, typically worsening in the week before a period when progesterone rises and estrogen drops. Conditions like polycystic ovary syndrome (PCOS) can amplify this by raising overall androgen levels. Oil glands also respond to growth signals from insulin and a related hormone called insulin-like growth factor 1 (IGF-1), which connects hormonal acne directly to diet.
How Stress Gets Under Your Skin
Stress doesn’t just make you feel like your skin is worse. It physically changes how your oil glands behave. When you’re under sustained stress, your body produces cortisol through a chain reaction that starts in the brain and ends at the adrenal glands. Your skin cells, it turns out, run a miniature version of that same stress-response system. Skin cells can independently produce stress hormones, and those hormones bind to receptors on oil glands, ramping up sebum production.
Chronic stress also blunts cortisol’s normal ability to keep inflammation in check. Over time, your immune cells become less responsive to cortisol’s “stand down” signal, allowing inflammatory compounds to build up unchecked. The result is skin that’s simultaneously oilier and more inflamed, which is exactly the combination that produces deep, painful cystic breakouts rather than surface-level pimples.
Foods That Can Trigger Breakouts
Two dietary patterns have the strongest evidence linking them to adult acne: high-glycemic foods and dairy.
High-glycemic foods, things like white bread, sugary drinks, pastries, and white rice, cause a rapid spike in blood sugar. Your body responds by releasing insulin, which in turn raises levels of IGF-1. IGF-1 stimulates oil production and promotes the kind of cell overgrowth that clogs pores. In a randomized controlled trial, adults with moderate to severe acne who switched to a low-glycemic diet for just two weeks saw a significant drop in their IGF-1 levels, from an average of 267 to 245 ng/mL. That’s a measurable hormonal shift from a relatively modest dietary change.
Dairy, particularly skim milk, has also been linked to acne in multiple observational studies. The proposed mechanism involves naturally occurring hormones and growth factors in milk that may amplify the same insulin and IGF-1 pathways. The evidence is stronger for milk than for cheese or yogurt, possibly because fermentation alters some of the bioactive compounds.
Skincare Products That Clog Pores
Sometimes the products you’re using to improve your skin are the ones causing breakouts. This is common enough that dermatologists have a name for it: acne cosmetica. It tends to show up as small, persistent bumps and blackheads, often in areas where you apply the most product.
Ingredients are rated on a comedogenic scale from 0 (won’t clog pores) to 5 (almost certainly will). Some of the worst offenders include:
- Isopropyl myristate (rating: 5), found in makeup primers and lotions
- Decyl oleate (rating: 5), common in sunscreens and moisturizers
- Coconut oil (rating: 4), which clogs pores in roughly 35% of users despite its popularity in natural skincare
- Lanolin (rating: 4), a wool-derived moisturizer in many facial creams
- Cocoa butter (rating: 4), widely used in lip balms and body creams
On the safer end, jojoba oil (rating: 2) closely mimics your skin’s natural sebum and rarely causes problems. Argan oil (rating: 1 to 2) is also generally well tolerated. If you suspect your products are contributing to breakouts, try eliminating one product at a time for several weeks to isolate the culprit.
Medications That Cause Breakouts
A number of commonly prescribed medications can trigger acne or make existing breakouts worse. The connection is well established for corticosteroids (oral, inhaled, and even heavy use of topical forms), lithium, testosterone therapy, and anabolic steroids. Roughly half of people who use anabolic steroids at high doses develop acne as a side effect.
Other medications linked to breakouts include certain antidepressants (particularly some serotonin-based ones), the blood pressure drug ramipril, the tuberculosis drug isoniazid, and high-dose vitamin B12 supplements (in the range of 5 to 10 mg per week). First-generation progestin-only birth control pills containing norgestrel or levonorgestrel can also worsen acne because these older progestins have testosterone-like effects on the skin.
Drug-induced acne looks slightly different from regular acne. It often appears suddenly, tends to be more uniform in size, and can show up on the chest and back as much as the face. If your breakouts started within weeks of beginning a new medication, that timing is worth noting.
Perimenopause and Shifting Estrogen
Many women experience a new wave of acne in their 40s and 50s that catches them completely off guard. The trigger is the hormonal shift of perimenopause: estrogen levels decline and fluctuate unpredictably, while androgen levels stay relatively stable or decline more slowly. This creates a higher ratio of androgens to estrogen, and since estrogen normally helps keep oil production in check, the imbalance tips the scales toward oilier, more breakout-prone skin.
These breakouts tend to cluster along the jawline and chin, the areas most sensitive to hormonal fluctuation. They can persist through menopause and beyond, since the estrogen-androgen imbalance doesn’t necessarily resolve once periods stop.
Physical and Environmental Triggers
Friction and heat can worsen acne in ways that have nothing to do with hormones. Face masks became a well-documented example during the pandemic. Masks create a warm, humid microenvironment against the skin, and sebum production increases by roughly 10% for every 1°C rise in skin temperature. The trapped moisture and carbon dioxide cause skin cells to swell, blocking pores, while the altered pH encourages acne bacteria to multiply.
The same principle applies to anything that presses against your skin for extended periods: phone screens held to your cheek, helmet straps, headbands, or the habit of resting your chin in your hands. If your breakouts cluster in areas of regular contact or pressure, mechanical irritation is likely playing a role.