The hair on our bodies has a particular structure and is divided into thin and thick hair. Thin hair, also called lanugo or vellus, is located on all skin surfaces except for the palms of the hands and the soles of the feet. Thick hair, also called terminal hair, is dark and located only in some areas such as the scalp, the armpits, the pubic area, the beard area in the case of men, etc…

La psoriasi è una frequente dermatosi cronica eritemo-squamosa con squama tipica (psoriasica), circoscritta o diffusa. La psoriasi è un problema del cuoio capelluto non annoverata tra le cause che comportano la caduta dei capelli. La psoriasi è un’anomalia annoverata tra le malattie della cute. Essa può insorgere a qualsiasi età ed ha la stessa incidenza sia negli uomini che nelle donne. Le placche o scaglie forforose (simili a quelle della forfora) possono essere molto varie sia nello spessore che nell’estensione e si staccano facilmente. Sotto di esse la pelle, a causa dell’irritazione, si presenta infiammata e di colore rosso vivo.

A shedding of hair is considered physiologically normal when hair loss is limited to around one hundred hairs per day. During an individual’s life hair grows, falls out and regrows around twenty times. Each cycle, especially for females, may last up to six years and if hair loss is found within this time frame, it is considered absolutely physiological.

The scalp is an ultra-specialized area of the skin, where hair is anchored. Like other hair, also the hair on the scalp originates from a hair follicle, called a bulb.Il cuoio capelluto è tenacemente adeso, con interposizione di scarsissimo tessuto connettivo, alla galea capitis, aponeurosi che riveste direttamente le ossa del cranio.

The sebaceous glands are glands that secrete sebum, an oily, acidic substance with a pH of 3.5. They are connected laterally to the hair follicle. Sebaceous glands are found with a density of approximately 100/cm2 throughout all areas of the skin. In the human body, they are located across the entire surface of the skin, except for the palms of the hands and the soles of the feet.

Some parameters and characteristics should be taken into consideration when assessing hair types and morphologies: shape, density and appearance. The appearance of hair, in the form of lanugo, occurs during the fourth month of pregnancy.