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

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" 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.