Oily Skin: Causes, Assessment & Treatment Options
Oily skin is not dirty skin, and it is not a failure of washing. The amount of oil on the surface is set mostly by how much sebum your sebaceous glands produce, and that is decided largely by genetics and by androgens. Cleansing removes the oil that is already there; it does not change how much is made, and washing harder than the skin tolerates usually provokes more oil rather than less. This site is about why the oiliness is there, whether it needs treating at all, and the ladder that runs from a gentler routine to prescription treatment — including its ceiling, because sebum production is managed rather than switched off.
Patient education reviewed by Yongbo Jia, MD. Oiliness that arrives with flaking, redness and itching, or suddenly in adult life alongside a change in periods or a new medicine, should be assessed rather than treated as a skin type.
Six things that decide how oily skin is
The first two are why oily skin runs in families and why it peaks in the teenage years. The middle two are the ones people make worse while trying to fix them. The last two are why an assessment comes before a routine rather than after it.
Glands that produce more sebum
Sebaceous glands sit in the skin alongside every hair follicle and deliver sebum to the surface continuously. How much they produce is largely inherited: two people can follow an identical routine and have completely different skin, because the difference lies in the glands rather than in the products. This is the single largest explanation for oily skin, and it is why the tendency so often runs in a family.
Androgens, which is why it peaks in the teens
Androgens drive sebum output and are present in both sexes. Levels rise through the teenage years, which is why oily skin and acne so often appear together at that age and why the oiliness frequently settles afterwards. Androgens also explain the other direction: a hormonal condition can produce oily skin in an adult who never had it before.
Over-cleansing that strips the surface
A strong cleanser used often removes the surface oil together with the lipids that hold water in the skin. The skin feels tight, then oily, and the natural response is to wash again. This is the cycle in which a person’s own routine becomes the thing driving the oiliness they are trying to treat, and it is commoner than any other correctable cause.
Heat and humidity
Sebum flows more readily when the skin is warm, and humidity spreads it across the surface. The same face can therefore read as considerably oilier in a Chongqing summer than in winter with nothing having changed in the glands. Heat also increases sweating, which mixes with the oil and makes the surface look and feel heavier than sebum alone would.
A hormonal condition
Polycystic ovary syndrome and other conditions that raise androgen activity commonly produce oily skin, often with acne along the jaw, a change in the menstrual cycle or unwanted hair growth. This is the cause most worth identifying, because treating it changes the skin as well as the condition behind it, and because it is the one a skin care routine will never reach.
Skin care that is wrong for the skin type
Rich creams, facial oils and several occlusive products layered together can make an oily skin look and feel worse, while very drying products provoke the same rebound as over-cleansing. Neither is a disease. Both are a mismatch between the products and the skin they are being applied to, and both are corrected by changing the products rather than by changing the person.
When oiliness is a condition rather than a skin type
Ordinary oily skin does not itch, flake or sting. A small number of people have something else, and the difference is made by what accompanies the oil rather than by how much of it there is. Flaking with redness and itching along the greasy areas — the folds beside the nose, the eyebrows, the hairline and behind the ears — usually means seborrhoeic dermatitis, an inflammatory condition that needs a diagnosis and medical treatment rather than a stronger cleanser. Oiliness that arrives suddenly in adult life, particularly with irregular periods, acne along the jaw or unwanted hair growth, points towards a hormonal cause that is worth testing for. Oiliness that begins after a new medicine, including some hormonal treatments and some supplements, is worth reporting rather than treating. A rash that is painful, blistered or spreading, oiliness accompanied by fever, or a change confined to one side of the face belongs with a doctor rather than with a skin care routine, and a persistent redness across the centre of the face with tiny bumps is a different condition again that scrubbing makes worse. None of this means oily skin is dangerous. It means that when oil is accompanied by inflammation or by a signal from elsewhere in the body, the routine is not the answer and the cause has to be named first. Where none of it is present, the ordinary conversation about a skin type can begin on a sound footing.
How oily skin is assessed
There is no number to reach and no measurement that decides this. What an assessment establishes is how much of what you see is gland output, how much is your own routine, and whether there is a condition underneath — because those three have different answers.
Where the oil sits, and when it appears
Distribution matters more than amount. Oil across the whole face including the cheeks behaves differently from oil confined to the forehead, nose and chin, which is the pattern that accompanies acne and the pattern a hormonal cause tends to produce. Timing matters as well: oiliness that is worst within an hour of washing suggests a rebound from the routine rather than gland output, and the two are treated in opposite directions.
Pore size and surface texture
Pores are the openings of the follicles the glands sit in, and they look larger where sebum production is higher. Their size is not a measure of how clean the skin is, and nothing applied to the face changes it. Pore appearance, blackheads and the texture of the surface are recorded because they change what is worth offering, not because they can be reversed.
Acne, and whether it is inflamed
Blocked pores, blackheads and inflamed spots are assessed separately from the oiliness, because they need their own plan and their own timing. Oiliness with marked acne is treated differently from oiliness with none, and the presence of scarring changes how soon treatment should start rather than which treatment is chosen.
Flaking, redness and itching
The greasy areas are examined specifically for the flaking, redness and itching that suggest seborrhoeic dermatitis rather than a skin type. This is the finding that most often changes the diagnosis, and it is easily missed when the consultation is limited to what might be done about the oil itself.
The history, and everything applied to the face
What you wash with, how often, what goes on afterwards, and what you have tried and stopped. The routine is often the most informative part of the consultation, because over-cleansing and heavy moisturisers each produce a pattern that imitates an intrinsic skin problem, and because changing one thing at a time is easier when the starting point is written down.
The hormonal signals worth testing
Cycle irregularity, acne along the jaw, unwanted hair growth and a sudden change in oiliness in adult life are the signals that justify looking for a hormonal cause. Where they are present, the assessment includes a blood test and, where appropriate, a referral, because treating that cause changes the skin as well as the condition behind it. Without those signals, testing is more likely to confuse than to help.
The ladder, from a gentler routine to prescription treatment
The rungs run from changing what you wash with to oral treatment, and the useful part is not the order but the ceiling above each one. Nothing on this ladder switches sebum production off. What the lower rungs do is stop the routine making things worse, which for many people is the whole of the problem. At the first rung, a gentle cleanser used twice a day at most, lukewarm water, and no scrubbing, exfoliating grains or cleansing brushes, removes the surface oil without stripping the skin. The second rung is the one that surprises people: a light, non-comedogenic moisturiser and daily sun protection, because skin that is not stripped produces less oil in response, and because sun damage thickens the surface and changes how the pores look. The third rung is the sebum-controlling actives, of which niacinamide and salicylic acid are the two most often used; they reduce the appearance of oil and of pore size over weeks rather than days and do not change how much the glands produce. Above those sits a prescription topical retinoid, which does change how the follicle behaves and takes months to show its full effect. Where a hormonal cause has been identified, a hormonal or oral agent can be discussed; an oral isotretinoin class medicine is the only rung that reduces sebum production substantially, and it is also the one with the most serious side effects, which is why it is discussed rather than offered. Peels and energy devices for pores and texture sit alongside these as a supporting rung rather than above them, and they change the surface rather than the gland. The ceiling does not move: sebum production is managed rather than switched off, oil is not a disease, and some people are better served by leaving a normal skin type alone.
Five ways people make oily skin worse
The first is to wash more often, or with something stronger, in answer to oil. That removes the lipids holding water in the skin, the skin feels tight and then oilier, and the routine becomes the cause of what is being treated. The second is to skip moisturiser because the skin is already oily; skin that is not kept hydrated produces more oil in response to the dryness, so a light moisturiser is part of reducing oiliness rather than an indulgence on top of it. The third is to scrub, use pore strips and squeeze blackheads. This removes oil for an hour, irritates the follicle and makes the pores look larger rather than smaller, and the strip takes the surface oil while leaving the gland untouched. The fourth is to buy a long course of blotting papers and mattifying products and treat that as treatment. They are honest cosmetic tools that do what they say for an afternoon; none of them changes how much sebum is produced, and a year spent on them is a year in which the things that do work were not used. The fifth is to treat flaking, redness and itching as though it were ordinary oily skin. That combination is usually a condition that needs a diagnosis, and cleansers and oil-control products tend to aggravate it rather than settle it. None of the five is rare, and every one is easier to avoid at the start than to undo afterwards.
If the decision moves toward treatment
This site stops short of describing procedures, because what a peel or a device does to the skin is explained properly elsewhere in this cluster. The wider picture of skin disease and skin health belongs to the dermatology and skin health hub, and the assessment and medical treatment of oiliness, acne and the conditions that imitate them are set out on Dr. Jia’s own site. Where oiliness comes with blackheads and inflamed spots, the routes that act on the surface of the face are gathered under facial skin aesthetics. The two rungs that sit alongside a routine rather than above it have their own pages: chemical peels for texture and pore appearance, and mesotherapy, which is sometimes offered for skin quality and which does not reduce sebum production. Before any of them, quality and surgical safety describes how safety is organised inside the hospital, and appointments explains how to arrange an assessment.
Oily skin: causes and the treatment ladder
Possible causes on the left and the ladder on the right, from least to most invasive. Note that the ladder starts at the product rather than at a device, that two of the causes are things a routine can create, and that the last line is the ceiling no rung reaches.
Guides
Ten guides, ordered the way the question usually unfolds: why the glands produce what they do, how the routine itself can drive the oiliness, how a skin type is told apart from a condition, and what each rung of treatment can and cannot change.
Oily Skin Is Sebum, Not Dirt
The shine on an oily face is sebum made by the skin’s own glands, not dirt left behind by washing. Why that distinction changes what is worth doing about it.
Read the guide →The Rebound Effect: When Cleansing Drives More Oil
Stripping the surface removes the lipids that hold water in, and the skin answers with more oil. How the cycle starts, why it feels like progress, and how it ends.
Read the guide →How Oily Skin Is Assessed
Where the oil sits, when it appears, what the pores and surface look like, and which hormonal signals justify a test. What it establishes, and what it does not.
Read the guide →Oily Skin in Teenagers and in Adults
Why oiliness appears with puberty and often settles afterwards, and why the same finding in adult life is a different question that sometimes deserves investigating.
Read the guide →What Reduces Sebum and What Only Removes It
Blotting, washing and mattifying remove oil that is already there. Actives and prescription medicines change what the glands and follicles do. Keeping the two apart.
Read the guide →Cleansing and Moisturising for Oily Skin
The routine that suits oily skin is built on restraint: a gentle cleanser twice a day, a light moisturiser on damp skin, and sun protection that is not skipped.
Read the guide →Find out whether it is a skin type or a condition
Arrange an assessment. We will say whether your oiliness looks like ordinary sebum production, a routine that is driving it, or something such as seborrhoeic dermatitis that needs its own treatment, and what each option can and cannot change.
Frequently asked questions
Is oily skin caused by not washing enough?
No. The oil on the surface comes from the sebaceous glands, and how much they produce is set largely by genetics and by androgens. Washing removes the oil that has already reached the surface and does not change how much is made. Washing more often than the skin tolerates removes the lipids that hold water in the skin, and the skin tends to answer with more oil rather than less.
Does oily skin still need a moisturiser?
Yes, and it is usually the step that gets skipped. A light, non-comedogenic moisturiser keeps the surface hydrated so the skin has less reason to produce oil in response to dryness. Heavy creams and facial oils are the wrong choice for this skin type, but no moisturiser at all is not the answer either.
Will my pores shrink if I clean them properly?
Pores do not open and close, and no cleanser changes their size. They are the openings of the follicles the glands sit in, and they look larger where sebum production is higher. What can change over months is how visible they are: the surface texture, the blackheads inside them and the inflammation around them respond to treatment, while the pore itself stays the size it is.
Can oily skin be a sign of a hormonal problem?
It can. Oiliness that arrives suddenly in adult life, particularly with irregular periods, acne along the jaw or unwanted hair growth, is worth investigating rather than treating as a skin type. Where a hormonal cause is found, treating it changes the skin as well as the condition behind it.
Is oily skin an advantage as skin ages?
Sebum is a natural moisturiser, and oily skin often looks less dry and less lined in later life than dry skin does. That is a real advantage and it is not a reason to treat a healthy skin type. It is not protection against sun damage either, which is the largest single factor in how skin ages, so sun protection stays part of the routine.
How long before a routine makes a difference?
Cleansing and moisturising changes are usually judged over two to four weeks, because the rebound from over-cleansing settles over that period. Actives that reduce the appearance of oil work over weeks to a few months, and a prescription topical takes longer still. Your own plan may differ, and the interval is worth asking about at the assessment.
Part of Dry and Sensitive Skin — 6 sites on this topic