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

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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