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Typologie de peau DP(-).

DP(-), what does this skin type signify?

The skin diagnosis that we have implemented at Typology allows us to assess the characteristics and needs of the skin based on three main criteria: sebaceous gland activity, skin aging, and oxidation factors. Following this analysis, 24 different skin typologies have emerged. Let's explore in this article what the DP(-) profile indicates.

I have DP(-) skin, what do these initials mean?

Skin Aging BEGINNER

Oxidation Factor PROTECTED

Sebum Production LOW (-)

The letter "D" for Beginner regarding skin aging.

The letter (D) indicates the appearance of the first visible signs of aging when the skin is in motion . Fine lines are the first to appear and are the easiest to spot. They are typically located at the outer corner of the eyes. A change in skin texture or a lack of radiance can also be observed. These are generally visible around the age of 25. Indeed, from this age, we see the start of a decline of about 1% each year in the production of collagen, one of the structural components of the skin, leading to a disorganization of the skin's connective tissue and a change in skin elasticity. A slowdown in the renewal of epidermal cells has also been observed, gradually leading to a thinning of the skin's barrier function. As a result of this phenomenon, water evaporates more and more: the skin then loses its brightness and wrinkles become more pronounced. A decrease in the production of hyaluronic acid by an average of 6% per decade adds to this.

The letter "P" stands for Protect against oxidation factors.

The letter "P" signifies that the skin is well protected against the sun's UV rays. Beyond their beneficial effects on mood or vitamin D secretion, excessive sun exposure is the main cause of premature skin aging and the onset of skin cancers. Indeed, UVA rays can cause dermal changes especially in the elastic tissue, and UVB rays lead to epidermal damage. Activation of free radicals, alteration of the cell membrane, DNA modification... UV rays act differently within skin cells to generate damage, which can alter the cell's function, cause its death, or trigger DNA mutations that eventually lead to the formation of cancerous cells. Thus, even though the skin has some defenses against UV rays (melanogenesis, endogenous antioxidant system...), it is important to regularly and adequately apply a sunscreen product that is suitable for one's skin type and sun exposure conditions, to ensure reasonable exposure while minimizing risks.

The symbol "-" for Low Sebum Production.

The "-" indicates a decrease in the efficiency of the sebaceous glands to produce enough sebum (sebaceous hyposecretion), as well as a discrepancy in the synthesis of natural moisturizing factors by keratinocytes, which give the skin the ability to retain water. Tightness, irritation, dehydration fine lines, redness, flaking, dull complexion... are characteristic of this skin type.

Indeed, this lack of lipids reduces the effectiveness of the hydrolipidic film. The skin then becomes vulnerable to all forms of aggression (UV rays, pollution, bacteria, etc.), triggering inflammatory responses, and no longer effectively prevents transepidermal water evaporation. Additionally, this alteration in the barrier function leads to a dysregulation of Langerhans cells (cells of the immune system), which begin to induce disproportionate inflammatory responses when they are overly stimulated.

Several factors can influence this low sebum secretion, leading to these disturbances: frequent washing, certain medications, inappropriate care, seasonal variations, tobacco, UV radiation, genetics... However, although this skin type is more prone to wrinkle formation due to its less flexible nature, it is, on the other hand, less susceptible to skin sagging since its thinner epidermis is less affected by the effects of gravity.

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