Why Is My Skin Oily? The Sebum Science Explained
Oily skin occurs when the sebaceous glands in the skin produce excess sebum, the natural oil that helps lubricate and protect the skin. Hormones, genetics, environmental conditions, and certain skincare products can influence how much sebum these glands produce. When oil production increases, the skin may appear shiny and pores can become more noticeable.
Understanding Sebum and Skin Oil
Sebum is a natural oil produced by the skin’s sebaceous glands. These glands are connected to hair follicles and are found across much of the skin’s surface.
Sebum plays an important role in maintaining healthy skin by:
• lubricating the skin
• supporting the skin barrier
• preventing excessive moisture loss
However, when these glands produce too much oil, the skin may appear shiny and pores may become more visible.
Hormones and Oil Production
Hormones are one of the strongest influences on sebum production.
Androgens, a group of hormones present in both men and women, stimulate sebaceous glands to produce oil. When androgen levels increase, sebaceous glands may become more active.
This is why oily skin is often more common during:
• puberty
• hormonal fluctuations
• periods of stress
Hormonal influences can increase the size and activity of sebaceous glands.
Genetics and Skin Type
Genetics also plays a significant role in determining how much oil the skin produces.
Some individuals naturally have larger or more active sebaceous glands, which can lead to higher levels of oil production.
This genetic influence helps explain why some people consistently experience oily skin while others have dry or balanced skin types.
Climate and Environmental Factors
Environmental conditions can also affect sebum production.
Warm temperatures and high humidity levels often stimulate oil production, which is why skin may appear more oily during summer months or in humid climates.
Conversely, colder climates may lead to reduced oil production but increased dryness.
Skincare Habits and Oil Balance
Certain skincare practices can influence how the skin regulates oil.
Overly harsh cleansers or excessive washing may strip the skin of its natural oils. In response, the skin may increase sebum production to compensate for the loss of protective lipids.
Maintaining a balanced skincare routine helps support the skin’s natural regulation of oil.
Oil, Pores, and Skin Texture
Excess oil production can also affect the appearance of pores.
When sebaceous glands produce more oil, the follicle opening may become more visible. Oil can also mix with dead skin cells, contributing to clogged pores and uneven skin texture.
Proper skin renewal and maintaining healthy skin function can help support smoother-looking skin.
The Bottom Line
Oily skin occurs when sebaceous glands produce excess sebum. Hormones, genetics, climate, and skincare habits can all influence oil production. Understanding the biological processes behind sebum production helps explain why pores may appear larger and why the skin may develop a shiny appearance.
Written by Alexander Brosda
CEO – Sokörpe Laboratories
Skincare formulation researcher and skincare science educator.
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