ABSTRACT
Non-scarring (or non-cicatricial) alopecia is more frequently seen in daily practice and can be caused by androgenetic alopecia, alopecia areata, telogen effluvium, or anagen effluvium. Scarring alopecia is rarer and is characterized by damaged hair follicles with permanent hair loss and skin scarring, such as lichen planopilaris or frontal fibrosing alopecia. Androgenetic alopecia (AGA) is the most common cause of non-scarring alopecia, affecting up to 50% of women and 80% of men, with a frequency increasing with age after puberty. Clinical manifestations of androgenetic alopecia are different in both sexes. The pull test typically shows telogen roots, but nowadays trichoscopy is the most important tool for diagnosis and it has completely substituted the scalp biopsy. The most common side effects are in the sexual sphere: loss of libido, erectile dysfunction, and problems with ejaculation, but they are rare and disappear with the withdrawal of the drug.
