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. 2022 Apr 10;14(4):268. doi: 10.3390/toxins14040268

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Guidance for injecting botulinum neurotoxin into the corrugator supercilii muscle. A total of 6 U is injected; each medial and lateral points is injected with 1.5 U. The medial point (black dot) is interciliary point located on frontal notch that can be palpated. The lateral point (orange dot) is the crossing point of mid-pupillary line and superciliary arch. Consent was obtained by the volunteer. (ML; midline, HL; horizontal intercanthal line, MP; mid-pupillary line, SA; superciliary arch).