The most common type of acquired alopecia is androgenetic alopecia, in 95% of male cases. It is is genetically determined and characterised by hair loss mainly in the frontal, occipital or parietal areas of the scalp (see Norwood scale). The condition is based on the activity of the male sex hormone called dihydrotestosterone (DHT), which affects the hair follicles.
Despite androgenetic type of alopecia being caused by the male sex hormones, the problem appears in women, in the rate of 20-90%, but the symptoms in women are not striking. At the same time, hormonal imbalances can occur both due to age-related processes or as a result of medication or after surgery. Women’s androgenetic alopecia affects the parietal, frontal, occipital areas (see Ludwig scale).
Diffuse alopecia or telogen effluvium alopecia is a process of proportional hair loss in all anatomical areas of the scalp. This form of alopecia is associated with a violation of the general metabolism, which leads to a failure of the hair growth cycle. By prevalence, this type of alopecia takes the second place and is more common in women. There are telogen and anagen forms of diffuse alopecia. As the name suggests, in the telogen form, most of the hair follicles go into the sleeping phase (telogen), ceasing to form the hair, but not dying. The causes of this type of baldness may be stress, hormonal.