Excess sebum production is driven primarily by hormones, particularly androgens like testosterone and its more potent form, dihydrotestosterone (DHT). But hormones are only part of the picture. Your diet, stress levels, genetics, medications, and even your skincare routine can all push your oil glands into overdrive. Understanding which factors apply to you is the first step toward managing oily skin effectively.
Your skin normally produces sebum at a rate of about 1 to 2 micrograms per square centimeter per minute. When production climbs above that range, skin becomes noticeably oily, pores appear larger, and breakouts become more likely.
Androgens Are the Primary Driver
The single biggest factor behind excess sebum is androgen activity. Testosterone circulates through the bloodstream and gets converted into DHT, a more powerful androgen, right inside the oil glands themselves. When DHT binds to androgen receptors on sebocytes (the cells that produce sebum), those receptors move into the cell’s nucleus and switch on a cascade of genetic signals. The result: cells grow larger, ramp up fat production, and begin synthesizing sebum-specific lipids like triglycerides and wax esters.
This isn’t a subtle effect. In lab studies, DHT alone is enough to push immature sebocytes into full lipid-producing mode, causing them to swell with fat droplets over the course of about seven days. The process depends entirely on having a functional androgen receptor. Without it, the same hormone exposure produces no change in oil output.
This is why excess sebum so often tracks with periods of hormonal change. Puberty floods the body with androgens for the first time, which is why oily skin and acne peak in the teenage years. Polycystic ovary syndrome (PCOS) raises androgen levels in women and commonly causes persistent oiliness and adult acne. And during perimenopause, falling estrogen levels leave androgens relatively unopposed, which can trigger a resurgence of oily skin and breakouts even in women who hadn’t dealt with them in decades.
How Diet Influences Your Oil Glands
What you eat affects sebum production through a hormonal pathway that centers on insulin and its close relative, insulin-like growth factor 1 (IGF-1). When you eat high-glycemic foods (white bread, sugary drinks, refined carbohydrates), your blood sugar spikes and your body releases a surge of insulin. That insulin activates a signaling chain inside sebocytes that ultimately switches on a key fat-producing protein called SREBP-1, which tells the cell to make more lipids. The same pathway also drives the cells to multiply faster.
A high-glycemic diet essentially amplifies this effect. The combination of elevated insulin and IGF-1 creates a hormonal environment that pushes oil glands to work harder, independent of your baseline androgen levels. This is one reason why dietary changes, specifically reducing refined carbohydrates and sugar, can visibly reduce oiliness for some people within a few weeks.
Dairy has also been linked to increased sebum, likely because milk naturally contains IGF-1 and can further elevate your body’s own production of it. The strength of the effect varies from person to person, which researchers suspect is partly due to genetic differences in how individuals process these signals.
Stress Triggers Oil Production Locally
Your skin has its own stress-response system that operates somewhat independently from the rest of your body. When you’re under psychological stress, your brain releases corticotropin-releasing hormone (CRH). But your sebaceous glands also have their own CRH receptors, and when CRH binds to them, it directly stimulates lipid synthesis inside those cells. CRH also activates an enzyme involved in converting weaker hormones into active androgens right at the skin level.
On top of boosting oil production, CRH triggers the release of inflammatory molecules (IL-6 and IL-8) from sebocytes, which helps explain why stress so reliably causes not just oilier skin but also inflamed breakouts. This local stress response means your skin can become oilier even if your blood hormone levels haven’t changed much. It’s a localized effect happening right inside the gland.
Genetics Set Your Baseline
Some people simply produce more sebum than others from the start, and genetics play a significant role in determining that baseline. The size and density of your sebaceous glands, how sensitive your androgen receptors are, and how efficiently your cells convert testosterone to DHT are all inherited traits.
Researchers have identified specific genes, including GOLGA7B, that appear to influence individual variation in sebum output. This genetic variability also helps explain why two people can eat the same diet or experience the same hormonal shifts but end up with very different levels of oiliness. Ethnicity plays a role as well, with studies showing measurable differences in average sebum production across different populations.
Medications That Increase Oil Production
Certain medications can significantly ramp up sebum output as a side effect. Two classes of drugs used to manage cholesterol and blood sugar, fibrates and thiazolidinediones, increased sebum production by 77% and 37% respectively in one clinical study. These drugs work by activating a family of receptors (PPARs) that happen to also stimulate fat production in sebocytes.
Anabolic steroids and testosterone replacement therapy are other well-known culprits, since they directly raise androgen levels. Some forms of hormonal birth control that contain androgenic progestins can also increase oiliness, while formulations with anti-androgenic progestins tend to reduce it. Corticosteroids, lithium, and certain anticonvulsants have been reported to worsen oily skin as well, though the mechanisms are less clearly defined.
Harsh Skincare Can Backfire
There’s a common belief that stripping oil off your face will make your skin less oily, but the opposite often happens. Harsh cleansers, alcohol-based toners, and overwashing can dry out the skin’s surface so aggressively that the oil glands compensate by producing even more sebum. Dermatologists refer to this as overcompensation by the oil glands, and it creates a frustrating cycle: the more you strip, the oilier you get.
This doesn’t mean you should skip cleansing. It means using a gentle, non-stripping cleanser and maintaining some level of hydration so your skin doesn’t interpret surface dryness as a signal to produce more oil. Switching from a harsh foaming cleanser to a milder one is sometimes enough to noticeably reduce midday oiliness within a couple of weeks.
Life Stages and Hormonal Shifts
Sebum production isn’t constant throughout your life. It follows a predictable arc tied to hormonal changes. Production is minimal in childhood, surges during puberty, and generally stays elevated through the 20s and 30s. For men, sebum output remains relatively stable into middle age because testosterone levels decline gradually. For women, the picture is more complex.
During perimenopause and menopause, estrogen and progesterone drop significantly while androgen levels decline more slowly. This creates a relative excess of androgens that can restimulate the oil glands. Many women in their 40s and 50s experience a return of oily skin and acne they thought they’d left behind in their teens. The menstrual cycle also creates monthly fluctuations, with sebum production typically peaking in the days around ovulation and in the luteal phase when progesterone (which has some androgenic activity) is highest.
Pregnancy brings its own shifts. Rising hormones can either increase or decrease oiliness depending on the individual, though many women notice oilier skin during the first and second trimesters as hormone levels climb rapidly.