Hair transplantation is a minimally invasive surgical technique in which follicular units (hair, root, sebaceous gland, sweat ...) are transplanted from areas resistant to the male hormone (dihydrotetosterone) to areas where there has been loss of density or quantity of hair.
Follicular units are normally taken from the nape and lateral areas, which are more resistant, to take them to those areas where alopecia is located.
A follicular unit can have from 1 to 7 hairs, but the most common is that it has an average of three. That is, when 2500 follicular units are transplanted, we are transplanting an average of 7500 hairs.
There are two hair transplant techniques: