Alopecia After Cosmetic Injection Procedures: A Review.

[BACKGROUND] Cosmetic procedures for antiaging carry inherent risks of adverse events. One that has not yet been well characterized is transitory or permanent alopecia. This is attributable to numerous mechanisms including pressure, ischemia, inflammation, and necrosis. Cases of postcosmetic procedure alopecia have been reported after mesotherapy as well as hyaluronic acid filler, deoxycholic acid, and botulinum toxin injections.

[OBJECTIVE] This review serves to describe the currently known causes of postcosmetic procedure alopecia and the mechanisms by which alopecia is attained. Furthermore, this review highlights the risk of unregulated mesotherapy injections for cosmetic enhancement and to bring attention to the increasing number reports of alopecia after these procedures.

[METHODS] A systematic review of the literature from 2000 to 2022 was conducted looking for keywords such as "alopecia," "cosmetic procedures," "mesotherapy," and "hyaluronic acid" in Google Scholar and PubMed.

[RESULTS] Ten articles met the criteria set forth in the authors' literature review. Many of the procedures resulted in partial or complete resolution of alopecia.

[CONCLUSION] Alopecia after cosmetic injection procedures is an underreported adverse effect. More research is needed to further characterize the risk of alopecia after mesotherapy and other injection procedures.