• Alopecia areata :

Alopecia areata is a common condition that affects between 1 to 3% of the world’s population. It causes total alopecia in well defined areas. It is an autoimmune disease caused by a disfunction in our immune system. It gets carried away and starts to produce white blood cells that attack the hair bulbs, as they attack a bacterium. The growth is stopped and hair falls. The bulb is not destroyed and at the end of the disease, the hair grows back identically. The most frequent spontaneous evolution is a total regrowth after a few months, first in the form of a discreet white fuzz then later by the same hair as those who had fallen.

• Anagen Effluvium:

EA is a sudden stop of hair growth in the anagen phase, without going through the telogen phase. The fall is acute and affects more than 90% of the hair. The two most common causes are radiotherapy and chemotherapy.

• FFA :

Frontal fibrosing alopecia (FFA) was described for the first time in 1994. It is characterized by cicatricial alopecia of the frontal implantation line. Alopecia of the eyebrows is frequently associated, as is alopecia of the pubis, face and hair. The clinical and histological features evoke the hair lichen, and the FFA is actually considered as a particular pattern of LPP. FFA most often affect postmenopausal women, but cases have been described in both men and young women. This disease has increased dramatically in recent years, becoming the leading cause of cicatricial alopecia. The pathophysiology remains unknown however scientists agree that it is a combination of genetic and environmental factors. In recent years some studies have involved the chemical sunscreens used in solar creams, without this being yet formally proven.