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. 2023 Mar 15;5:ojad007. doi: 10.1093/asjof/ojad007

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© The Author(s) 2023. Published by Oxford University Press on behalf of the Aesthetic Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — The Embryological Classification of Tubercles (LCT). Panels A-D show the upper lip pattern and E-H show the lower lip pattern. With respect to the upper lip, (A) Type 1, shown in a 26-year-old female, represents a single large middle tubercle occupying the full mid-third; (B) Type 2, shown in a 35-year-old female, represents a small middle tubercle occupying less than the mid-third; (C) Type 3, shown in a 27-year-old female, has an inverted tubercle; and (D) Type 4, shown in a 53-year-old female, is flat. With respect to the lower lip, (E) Type A, shown in a 33-year-old female, is represented by a central indentation. (F) Type B, shown in a 31-year-old female, has no central indentation and is full but level. (G) Type C, shown in a 30-year-old female, has no central indentation and curves upward with more fullness and Type B. (H) Type D, shown in a 49-year-old female, is flat.