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Quelles sont les causes de la dilatation des pores ?

What are the causes of pore enlargement?

Pores are essential to the skin. It is primarily through them that the skin expels dead cells, sebum, and sweat. However, pores can become clogged by an excess of sebum and corneocytes, dilate, and become very noticeable. But what causes this dilation? Discover our answers to this question in the following article.

The two types of pores, in brief.

Depending on the secretory glands to which they are connected, we distinguish two types of pores, which should not be confused.

  • The sebaceous pores

    As their name suggests, these pores distribute the sebum across the surface of the epidermis to moisturize the skin. They are located all over the body with a few exceptions such as the palms of the hands or the soles of the feet. They are connected to the sebaceous glands. These are generally attached to hairs (hair follicles), but there are some areas where they are not, such as on the eyelids.

  • sweat pores

    These pores allow the sweat produced by the eccrine sweat glands to be expelled. They cover theentire body and are not attached to hair follicles.

Note: On the face, the visible pores that are sometimes referred to as "dilated" are actually the sebaceous pores, called ostium (ostia in singular) in scientific language. It is this type of pores that we will be focusing on in the remainder of this article.

Enlarged Pores: What are the Causes?

Pores are dynamic structures whose size can fluctuate, although it is genetically determined. Thus, enlarged pores are characterized by a micro-depression on the surface of the facial skin with a "tangerine peel" appearance. According to a study, skin pores are considered "visible" and "enlarged" when their diameter fluctuates between 0.06 and 0.1 mm2.

Pores expand for a variety of reasons. This phenomenon is usually accompanied by the appearance of blackheads.Blackheads, as well asdilated pores, are most often visible onoily skin,combination skin,or onblemished skin. They primarily appear on theT-zone (forehead, nose, and chin), the parts of the face where the skin is oilier. Here are the main contributing factors.

  • Hyperseborrhea

    Studies have shown that there is a correlation between sebum production and pore size, meaning the more sebum the skin produces, the larger the pores will be. Additionally, with hyperkeratinization (accumulation of dead cells), "plugs" known as comedones form. These can then oxidize and form blackheads.

  • Skin Aging

    This cause is less known, yet it holds significance. Let's recall that the skin is supported by a dermal network of fibrous proteins (collagen and elastin) that provide it with firmness and elasticity. As we age, the production of these proteins slows down, the skin sags, and the sebaceous pores can no longer maintain their shape. They slowly succumb to gravity, stretching a bit more over time.

  • A hormonal imbalance (during menopause, puberty, or pregnancy)

    Hormonal stimulation of the sebaceous glands can lead to the dilation of pores.

  • An unhealthy lifestyle

    Tobacco use or poor nutrition can be the cause of this phenomenon.

  • The sun and UV rays

    After prolonged exposure to the sun, the skin tends to thicken and easily retain sebum.

  • Hereditary factors (genetic predisposition) and hair thickness

  • Theuse of unsuitable skincare products such as comedogenic products and poor skin hygiene

    For instance, not removing makeup leads to the accumulation of dirt and impurities on the skin's surface.

  • The gender of the individual in question

    Men's skin is generally oilier than women's because they have more sebaceous glands. Therefore, men are more prone to impurities and enlarged pores.

Enlarged Pores: What treatments should be used?

In order to reduce the visibility of pores, AHAs (alpha hydroxy acids) are formidable. Therefore, it is highly recommended to use an astringent care product such as a serum highly concentrated in glycolic acid, which has the power to eliminate dead skin cells and thus facilitate the return of smoother and more unified skin. In addition to its peeling effect, this acid also has a stimulating effect on the synthesis of hyaluronic acid and cell renewal.

An alternative for sensitive skin is thelactic acid, which is gentler and less irritating than glycolic acid due to its larger size (thus, it penetrates less deeply into the skin).


  • CHUNG K. & al. Sebum output as a factor contributing to the size of facial pores. British Journal of Dermatology (2006).

  • SEO S. J. & al. Facial pores: definition, causes, and treatment options. Dermatologic Surgery (2015).


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