A shiny T-zone by midday, makeup that seems to slide off, and pores that feel constantly clogged are the hallmarks of oily skin. It can feel like a losing battle, but oil production is driven by specific, identifiable factors that are largely manageable once understood.
Quick Answer
Oily skin is most often caused by genetics, hormonal fluctuations, overwashing, or using the wrong skincare products. Excess sebum production is the underlying cause in nearly all cases, and it responds well to a consistent, balanced routine.
Common Causes of Oily Skin
Genetics
Sebaceous gland size and activity are largely inherited, which is why oily skin often runs in families regardless of skincare habits.
Hormonal Fluctuations
Androgens stimulate oil production, which is why oiliness often increases during puberty, before menstruation, and can shift during pregnancy or perimenopause.
Overwashing or Harsh Products
Stripping the skin’s natural oils too aggressively can trigger it to overcompensate by producing even more oil, ironically worsening the problem.
Using the Wrong Moisturiser
Skipping moisturiser because skin feels oily can backfire, since dehydrated skin often produces more oil to compensate for the lack of moisture.
Climate and Humidity
Hot, humid weather increases sebum production and can make oily skin noticeably worse during certain seasons.
Diet
High-glycemic foods and dairy have been linked to increased oil production in some people, likely through their effect on insulin and hormone levels.
Stress
Stress raises cortisol, which can stimulate the sebaceous glands and increase oil production, particularly during high-stress periods.
How to Manage Oily Skin
- Cleanse twice daily with a gentle, non-stripping cleanser rather than washing excessively
- Use an oil-free, non-comedogenic moisturiser, even if skin feels oily
- Incorporate ingredients like niacinamide or salicylic acid to help regulate oil production
- Use blotting papers throughout the day rather than washing repeatedly
- Choose lightweight, non-comedogenic sunscreen and makeup products
- Avoid touching your face throughout the day, which can transfer additional oil and bacteria
When to See a Dermatologist
- Oily skin is accompanied by persistent, painful, or cystic acne
- Standard skincare routines haven’t helped after several months
- Oiliness changed suddenly and significantly
- You suspect a hormonal condition like PCOS may be contributing
FAQs
Does oily skin mean I don’t need moisturiser?
No. Skipping moisturiser can actually increase oil production, since dehydrated skin often overcompensates. A lightweight, oil-free moisturiser is still important.
Can diet really affect how oily my skin is?
For some people, yes. High-glycemic foods and dairy have been linked to increased oil production, though the effect varies between individuals.
Will my skin become less oily as I get older?
Often, yes. Oil production naturally tends to decrease with age, particularly after the hormonal shifts of perimenopause and menopause.
Conclusion
Oily skin is usually driven by genetics, hormones, or skincare habits, and responds well to a consistent, gentle routine rather than aggressive stripping. Persistent or worsening oiliness, particularly alongside acne, is worth discussing with a dermatologist.
Last reviewed: August 2026. This article is for general information only and does not replace professional dermatological advice. If oily skin is severe or persistent, please speak to a dermatologist.
