What Is Sebum? Function, Causes, and How to Balance It in Malaysia

Quick answer: Sebum is the natural oil made by your sebaceous glands. It protects your skin and hair from moisture loss. Hormones, mainly androgens, control how much you make, so output peaks around puberty and falls with age. Too much sebum can clog pores and contribute to acne and oily skin, while too little leaves skin and hair dry. You can balance sebum with gentle cleansing, the right actives and, in some cases, medical treatment.

What Is Sebum?

Sebum is an oily, waxy substance released by the sebaceous glands in your skin. It is made mostly of fatty acids and triglycerides, with smaller amounts of wax esters, squalene and cholesterol. Its main job is to limit water loss from the skin.

The “oil” you see on your face is not pure sebum. It is usually a mix of sebum, sweat, dead skin cells and particles from the air, which is why it feels worse in Malaysia’s hot, humid weather. Sebum is not the enemy. You need some of it for healthy skin. Problems start when there is too much or too little. For the Malay version, read kulit berminyak: punca, cara mengatasi dan rawatan (Malay).

Where Do Sebaceous Glands Come From, and Where Are They Located?

Sebaceous glands are tiny glands found in most of the skin, usually attached to hair follicles. You have thousands across your body. They are most concentrated on the face and scalp, which is why these areas get oily first. They are absent from the palms of your hands and the soles of your feet.

Because the forehead, nose and chin have the most glands, they are often the oiliest part of your face. Read what the T-zone is and why it’s oily. For more detail on how the glands work, see Cleveland Clinic’s guide to sebaceous glands.

What Does Sebum Actually Do?

The best-established role of sebum is to protect skin and hair from drying out. It helps keep the skin barrier flexible and reduces friction. Researchers are still studying other possible roles, including defence against microbes, antioxidant activity and chemical signalling. The full picture is not yet well understood. To learn how the barrier works, read skin barrier: signs of damage and how to fix it.

What Controls How Much Sebum You Produce?

Androgens (sometimes called “male hormones”, though everyone has them) are the main driver. Higher androgen activity generally means more sebum. Production changes through life, rising sharply at puberty and declining gradually with age. Genetics also play a part, as does your environment.

Hormones

Androgens come from the adrenal glands, ovaries or testes and are regulated by the pituitary gland. Hormonal swings from puberty, the menstrual cycle, pregnancy or conditions such as PCOS can all change how oily your skin is. Progesterone is also linked to higher sebum output, although the reason is not fully clear. If breakouts follow your cycle, read hormonal acne, or see causes of PCOS if you also have irregular periods.

Age

The glands are active before birth, and newborns may have relatively high sebum levels for a few months. Output then falls during childhood and rises sharply at puberty, when many teenagers develop oily skin and acne. Teenage boys often produce more than teenage girls. After that, production declines gradually, which is why skin often becomes drier later in life.

Medications and Medical Conditions

Some medications and medical conditions can increase sebum, including certain hormones and Parkinson’s disease. Others can reduce it, such as some contraceptive pills, anti-androgen medicines and isotretinoin. Severe malnutrition may also reduce it. Disorders of the pituitary, adrenal glands, ovaries or testes can push output either way. If your skin changes suddenly, talk to a doctor.

How to Reduce Excess Sebum (Oily Skin or Hair)

You can reduce how oily your skin looks and feels, but you cannot “close” or shrink the glands with skincare. Options include:

• Skincare basics. Wash twice a day with a gentle gel cleanser, moisturise with an oil-free formula and wear sunscreen. Over-washing can irritate the skin and make it oilier. If you wear sunscreen or make-up every day, double cleansing at night may help.
• Oil-control actives. Ingredients such as niacinamide, salicylic acid and retinoids can help control oil and unclog pores. Retinoids reduce sebum production, but they do not shrink the glands. Read how to use retinol correctly (Malay).
• Prescription options. Combined oestrogen-progestin contraceptive pills may reduce sebum in some women, and isotretinoin markedly reduces sebum in severe acne. Both are prescription medicines with important risks and must be started and monitored by a doctor. See isotretinoin in Malaysia.
• Diet. Limiting blood-sugar spikes and saturated fat may help some people, but the evidence is still limited. Read food and acne: truth or myth (Malay).
• Appearance control. Blotting paper and mattifying products manage shine but do not change how much oil your glands make.

Excess sebum can clog pores and lead to blackheads, whiteheads and acne. Learn more about acne-prone skin and the right routine, or check your products with the pore-clogging checker. Oily scalps can also cause flaking, so read dandruff: causes and treatment (Malay).

How to Boost Low Sebum Production (Dry Skin or Hair)

If your skin or hair feels dry and tight, you may not be making enough sebum, or you may be removing it too quickly. You cannot easily “boost” sebum directly, but you can protect what you have:

• Remove drying ingredients. Cut back on alcohol, strong acids and fragrance in skincare, haircare and detergents.
• Use lukewarm water rather than hot water.
• Moisturise consistently, ideally on damp skin after bathing.
• Eat enough healthy fats, including omega-3 sources like oily fish.
• See a doctor if dryness is sudden or severe. Low sebum can sometimes relate to a hormonal or medical cause that needs assessment.

Dry skin and dehydrated skin are not the same thing. Read kulit kering: punca dan cara melembapkan (Malay).

Is There a “Normal” Amount of Sebum?

There is no single “ideal” amount. What matters is how your skin feels and behaves. Healthy sebum levels mean comfortable skin, without excess oiliness, severe acne, or dryness and cracking. Your normal can differ from someone else’s. Find yours with what is my skin type.

Frequently Asked Questions About Sebum

Is sebum the same as facial oil? No. Facial oil is a mixture of sebum, sweat, dead skin cells and environmental particles. Sebum is only one part of it.

Why does puberty make my skin oilier? Puberty brings a surge in androgen activity, which stimulates the sebaceous glands to make more sebum.

Does birth control affect sebum? Combined oestrogen-progestin pills may reduce sebum. Progestin-only pills generally do not. Discuss any hormonal medicine with your doctor.

Does sebum decrease with age? Yes. Production peaks before adulthood and then declines gradually, which is why skin often becomes drier later in life.

Does diet affect sebum? Possibly, through blood sugar and saturated fat, but more research is needed. A balanced diet is a sensible choice either way.

Bottom Line

Sebum is a normal and useful skin oil, but too much can clog pores and contribute to acne and oily skin, and too little leaves skin dry. Hormones, age, genetics, medication and climate all influence it. At CLEO clinic, skin is assessed under the supervision of doctors accredited under the Ministry of Health’s Local Credentialing Programme (LCP), who can recommend a plan for your skin. See our acne treatment page or book a consultation.