Despite the fact that the person no longer needed hair for protection, insulation and camouflage, they are still very much needed in order to create your own character and be recognizable. Appropriate hairstyle and hair care are still important things in the social organization and human relations.

In the human body there are approximately five million hair follicles, and from 100000 to 150000 follicles on the head (before the hair loss). Blondes have more total follicles on the head, brunettes follow them. The lowest number of follicles on the scalp in people with red hair. Average growth rate of the hair – one-fifth to a quarter of an inch per month.

To understand why hair loss occurs, it is important to understand the normal cycle of hair growth. The hair follicle is an anatomical structure, from that grows and develops the hair shaft. Hair consists of a protein called keratin. Human hair grows by continuous cycles of growth and rest, called “hair growth cycles”.

There are three phases in the cycle: anagen – the phase of growth, catagen – the phase of degradation; telogen – the phase of rest. Over a period of growth (anagen) lasting from two to eight years should be a short period of two to four weeks, during that the follicle is almost totally destroyed (catagen). Then begins phase of rest (telogen), that lasts from two to four months. The hair dropping occurs only in the next cycle of growth (anagen), when begins a new hair shaft.

On average, each day we lost 50-100  hairs. This normal loss of hair and that hair is about half of the hair that you leave in the bathroom and on the hairbrush. These hair will grow again. There are not more than 10 percent of the follicle is in a resting phase (telogen) at any time. Many reasons can affect the hair growth cycle and cause temporary or permanent hair loss (alopecia), including such as taking medication, radiation, chemotherapy, chemical exposure, hormonal processes and nutrition, thyroid problems, general or local skin disease and nervous tension.

Androgens (testosterone, dihydrotestosterone) are the most important regulators of the growth of a human hair. Androgens are necessary for the growth of beard, axillary, and frontal hair. The growth of hairs on the head is not dependent on androgens, but androgen influence on the development of female and male-type baldness.

Acne – is the result of chronic inflammation of the sebaceous glands in the pathogenesis of that is genetically predetermined level of secretory activity, hormonal imbalance and hyperkeratosis.

Why is this unpleasant disease makes itself felt most often as a teenager? The fact that during puberty in the blood increased the content of sex hormones and adrenal androgens many times over that amplifying the work of the sebaceous glands. Sebum generated by them – is an essential element of the hydro-lipid mantle of the dermis, that consists of complex compounds of acids, polyhydric alcohols, glycerol, cholesterol, wax esters.

An increased allocation of dermal secret is not a risk in itself, but in parallel in the mouths of the sebaceous duct thickens corneocites layer (dead cells of the epidermis) and there is the notorious hyperkeratosis, that has hampered sebum access to the surface. Gradually sebum builds up more and more, and in this full of lipids (fat-like substances) environment are beginning to actively proliferate Propionibacterium acnes – the bacteria that live in the microflora of the sebaceous glands.

They intensively produce lipase – an enzyme, splitting glycerol to free acids, the abundance of that clogs ducts more, as a result leads to the formation of traffic jams – comedones. Under comedones feel great staphylococcus, streptococcus and other pathogens of purulent infections. They easily penetrate into the dermis in violation of a protective barrier of the epidermis and the normal microflora, as well as lowered immunity.

Thus, for acne can be noted:

• Increased sebaceous secretion, mainly in the so-called T-zone (forehead, nose, chin);
• Primary non-inflammatory elements – different types of comedones: (white acne or whitehead, black dots, microcysts, etc.);
• Inflammatory elements, such as red pimples or papules and pustules (red on the periphery with a white head in the center);
• Deep nodal skin lesions, stagnant spots and scars.