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In this study, BTXA injections did not effectively treat recalcitrant alopecia areata or improve hair regrowth in most patients, suggesting its limitations as an alternative therapy.

This study found that one session of intradermal botulinum toxin type A injection decreased scalp sebum secretion and perception of greasiness more effectively than saline for up to 3 months.

This case report suggests that intradermal botulinum toxin type A may alleviate pruritus and reduce papules in Fox-Fordyce disease, improving quality of life without serious adverse effects for at least six months.

In this retrospective analysis, patients with trichodynia who were unresponsive to standard treatments showed significant symptom improvement after receiving intradermal botulinum toxin type A, with nearly all patients benefiting, particularly those with scarring alopecia.

In this study, intradermal injection of botulinum toxin type A significantly increased hair count and improved physician-assessed hair condition in men with male pattern baldness after 24 weeks, with no serious adverse events reported beyond temporary local pain and redness.