Termenul de alopecie se refera la pierderea foliculilor pilosi (firelor de par) de pe una sau mai multe zone ale corpului.
Fiecare persoana pierde zilnic in jur de 100 de fire de par. Acesta cadere nu este totusi sesizata de pacient datorita faptului ca firele de par sunt imediat inlocuite de altele noi. In cazul persoanelor cu alopecie, firele de par nu vor fi inlocuite de unele noi.
Fazele de crestere ale firului de par
Cresterea firelor de par se desfasoara de-a lungul unui ciclu ce dureaza in medie 3 – 4 ani. Acesta cuprinde urmatoarele faze:
Anagen- faza de crestere propriu-zisa. Dureaza intre 3 si 7 ani (variaza in functie de regiunea anatomica).
Catagen – este o faza de tranzitie. Dureaza intre 1 si 3 saptamani. In aceasta etapa procesul de crestere incetineste sau se opreste.
Telogen – firul de par cade spontan la sfarsitul acestei faze. Dureaza in medie 3-4 luni.
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