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There are several types of alopecia, each one of them caused by different factors.

Androgenic alopecia is the most frequent, responsible for more than 90% of cases. It is due to an increased action of male hormones or androgens on certain areas of the scalp that are genetically predisposed to the condition. It causes a progressive decrease in the activity of the hair follicle that decreases in size until total atrophy of the hair bulb occurs with the consequent loss of hair.