Doctors: Don’t believe the trend

– If your skin is healthy and functioning normally then gentle care is the best. But I have recommended it to some patients who, for example, have skin irritations or react to a product. And if you use a lot of different products, the chance of a cross reaction increases.

She believes many people can have pimple outbreaks if they cut products they have used over a period of time.

– I think if you are used to using products that reduce sebum production, you can have pimple outbreaks if you suddenly end up with everything. And if you stop applying moisture you can get dry skin, which in turn can cause impurities, she says.

However, she points out that sometimes it is advisable to let the skin breathe occasionally, for example by not making a make-up occasionally.

– But I don’t think anyone with normal skin should benefit from stopping skin care. It is important to maintain a good skin barrier especially with regard to sun exposure, UV rays and pollution.

She points out that one does not need endless products every morning and evening to give the skin the nutrition and protection it needs.

– You have to have a good cleanser that is adapted to your skin and a peel maybe once a week, a good moisturizer and a serum. And sunscreen. Then you really have what you need.

To understand your skin, you must know its composition even at the cell level.

The skin is the largest organ in the human body, accounting for 16% of its total weight. Composed of several layers of tissue, it forms a protective barrier for the body against the external environment and also provides other vital functions.

Chemically, the skin includes on average:

– 70% water

– 27.5% protein

– 2% fat

– 0.5% of mineral salts and trace elements

It consists of three layers of tissue:

– The epidermis, the superficial layer

– The dermis, intermediate layer

– The hypodermis, deep layer

Skins composition

The epidermis

The epidermis is an epithelial tissue of semipermeable coating. It is composed of three types of cells:

– Keratinocytes, filled with keratin (a protein also used in the composition of hair and nails) and lipids

– Melanocytes, which produce melanin responsible for the pigmentation of the skin

– Langheran cells, which participate in the immune system of the skin

The epidermis in turn is divided into five layers.

– Corneal layer (stratum corneum), composed of corneocytes, results of the final phase of mutation of keratinocytes that rise progressively from the basal layer, and epidermal lipids.

Its lower third constitutes a real barrier of protection against exogenous factors (pollution, sun, cold) and endogenous water loss.

– Clear layer (stratum lucidium), which corresponds to a transition phase between the granular layer and the stratum corneum.

– Granular layer (stratum granulosum), where the keratinization of keratinocytes (which evolve into corneocytes) begins.

– Thorny layer or mucous body of malpighi, with 3 to 10 layers of keratinocytes that flatten gradually towards the surface.

– Basal layer, the deepest of the epidermis. It ensures the continuous regeneration of the skin by cell division: the cells produced migrate gradually to the upper layers undergoing various mutations. Between these basal cells are melanocytes, responsible for melanogenesis.

The dermis

The dermis is a connective tissue, which supports the epidermis, protects the vascular network and nerve fibers. The dermis is divided into two layers:

– The papillary dermis (superficial dermis), an intermediate layer rich in nerve endings and in permanent symbiosis with the epidermis, from which it is separated by the dermal-epidermal junction

– The reticular dermis (deep and medium dermis), a dense connective tissue composed of a network of elastic fibers.

It has different types of cells:

– Fibroblasts (cells that synthesize collagen, a protein essential to the elasticity of tissues)

– Histiocytes and mast cells, which play an important role in the immune reactions of the skin.

The hypodermis

The hypodermis is an adipose tissue located under the dermis. It is crossed by the vessels and the nerves arriving in the dermis.

He plays several roles:

– Protector, it serves as a damper between the dermis and the bones

– Thermal insulator

– Morphological, it shapes the silhouette according to the age, the sex, the nutritional state of the individual

– Energetic, by the storage of fats.

At the level of the dermis and the hypodermis, are also born what are called appendages of the skin:

– The sweat glands (or sweat) eccrine, which make the sweat watery

– The apocrine sweat glands, responsible for body odor

– Sebaceous glands secreting sebum, this hydrolipidic film that protects the epidermis

– The hair follicles of hair and hair, associated with a sebaceous gland.

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