What causes oily skin?
Sebaceous glands produce sebum, the skin's natural oil. Output can rise during puberty, hormonal phases and with a genetic tendency.
Sebum forms a protective layer on the skin; the aim is balance, not removing it entirely. Production is influenced by hormones such as androgens, age, heat and humidity, some medicines and genetics. The effect of stress and diet varies between people, and the evidence is not clear on every point.
Products that dry the skin excessively and harsh scrubbing often damage the barrier, so skin can look both oily and sensitive. For this reason a moisturiser is generally recommended even for oily skin. A sudden increase in oiliness, or one that comes with irregular periods or excess hair growth, may need medical assessment.
Can pores shrink, and why do blackheads form?
Pore size is largely genetic and cannot be changed, but pores can look less obvious when congestion is reduced and skin texture improves.
Blackheads form when sebum and dead cells collect in a pore and darken on contact with air. Squeezing them raises the risk of inflammation and marks. Oil-soluble exfoliants such as salicylic acid, and retinoids, may help reduce congestion; the choice depends on skin type.
Sun damage and collagen loss loosen the tissue around pores, so they may look larger with age. Sun protection is therefore a quietly important part of pore care.
What should daily care look like for oily skin?
A mild foaming cleanser, an oil-free moisturiser and daily sunscreen are a sound base for most people. Active ingredients are added slowly.
Washing the face up to twice a day is a common approach; frequent harsh cleansing does not reduce sebum and can make skin sensitive. Ingredients such as niacinamide, salicylic acid or a retinoid are tried one at a time and at low frequency, so an irritating product is easier to identify.
Choosing oil-free or non-comedogenic makeup and sunscreens may reduce congestion. For the overall framework see the skincare routine guide.
When is medical support needed?
Widespread acne despite care, painful cysts, scarring or a sudden rise in oiliness calls for a dermatology assessment.
Prescription topicals, hormonal evaluation or oral medicines are started only on a doctor's decision. Chemical peels and some device treatments may target oiliness and pore appearance, but active infection, recent isotretinoin use, pregnancy and sunburn change the plan.
At consultation the doctor reviews your skin, history and medicines and decides whether a procedure is suitable. Results vary and no specific outcome can be promised.
Frequently asked questions
Does oily skin need a moisturiser?
Usually yes. A light, oil-free moisturiser supports the barrier; lack of moisture can make skin seem to produce even more oil.
Can pores be closed completely?
No. Pores are part of normal skin. Reducing congestion and supporting skin quality can soften their appearance.
Is squeezing blackheads harmful?
Yes, it can raise the risk of inflammation, redness and marks. For persistent or widespread blackheads, seeing a specialist is safer.
Should oily skin use sunscreen?
Yes. Gel or fluid, oil-free textures can be chosen. Sun damage increases ageing and pigmentation.
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This content is for general information and does not replace a personal medical assessment.