Assessment of efficacy of different botulinum toxin A concentrations in the treatment of androgenetic alopecia assessed by dermoscopy.

Background: Androgenetic alopecia (AGA) is the most common type of progressive hair loss in men and women. AGA is characterized by the miniaturization of the hair follicle, leading to the transformation of terminal hair to vellus hair.

Objective: To evaluate the efficacy and safety of injecting two different concentrations of botulinum toxin A (BTA) for the treatment of AGA in Egyptian patients.