Lip shapes: contour, volume, and proportions beyond the labels

Editorial responsibility: My Best Version. About MBV · Sources, review and corrections (Portuguese).

English guides · About MBV · Português

Thin, full, heart-shaped, or sharply outlined: everyday labels describe different aspects of lips. They are not mutually exclusive anatomical categories. A useful analysis separates contour, visible dimensions, and projection rather than assigning a person to one ideal type.¹,²

What are we looking at?

The vermilion is the visible reddish portion of the lips. The Cupid’s bow is a contour of the upper lip; it does not by itself indicate three-dimensional volume. Visible height, width, surface area, and forward projection are different measurements.¹,²

Three-dimensional morphological research uses defined measurement methods. A frontal photograph may show apparent dimensions, but it cannot alone provide a clinical measure of lip volume.³

Features can coexist

Lips may have a prominent Cupid’s bow and limited visible height, a rounded outline with greater fullness, or a relatively straight upper contour. One lip may look more prominent in the front view while the relationship appears different in profile. These observations should be kept separate from a treatment recommendation.¹,²

Our AI-generated examples explain visual differences. They are not clinical cases, results of filler injection, or a complete representation of human diversity.

Are numerical proportions universal?

Research on female lip aesthetics has used manipulated images to investigate observer preferences. A preferred ratio in one experiment—such as an upper-to-lower relationship of 1:2—describes the tested images and the measure used, not an obligation for every person’s lips.⁴ Area, height, and volume ratios should not be treated as equivalent.

A cross-cultural analysis of lip attractiveness also shows why preferences must be interpreted with attention to the observers and context. Group judgments are not a personal diagnosis of disproportion.⁵

Age, sex, and population context

Three-dimensional research has examined age- and sex-related variation in lip morphology. Findings about averages do not determine what one individual’s lips should look like.³ A Brazilian stereophotogrammetry study examined morphology in a defined sample of Caucasian participants aged 20–50; its population and method should accompany any interpretation rather than being presented as a norm for all Brazilians.⁶

The profile links lips to the nose and chin

An isolated lip outline does not show its relationship with the rest of the face. Front and profile views answer different questions. Explore nose shapes and facial harmony to understand contour, projection, and the visual role of the chin.

Everyday care and cosmetology

For dry, chapped lips, institutional dermatology guidance discusses protective care and avoiding irritating products. Surface care and injectable augmentation have different purposes. A balm should not be described as producing the same anatomical effect as a filler.⁷

Persistent inflammation, scaling, cracking, or other concerning changes may require assessment. Cheilitis has multiple possible causes, and a differential-diagnosis review is more relevant than choosing additional products solely for appearance.⁹

What fillers can—and cannot—tell us

A meta-analysis has examined hyaluronic-acid fillers for lip augmentation. Its findings concern the interventions and outcomes studied; they do not establish that every formulation, technique, person, or desired shape will respond alike.⁸

Injection can cause swelling, bruising, and other reactions. The US FDA describes rare but serious harms associated with inadvertent injection into a blood vessel, including tissue necrosis, visual impairment, and stroke. Its regulatory information applies to the United States and does not replace Brazilian regulatory requirements.¹⁰

A simulation cannot determine how much product is appropriate, whether treatment is indicated, or what a result will look like. Discuss anatomy, expectations, alternatives, risks, and the option of not treating with a qualified professional.

Frequently asked questions

Are thin lips less attractive?

There is no universal conclusion. Preferences in image-based studies depend on the tested variants and observers.⁴,⁵

Does a sharper Cupid’s bow mean more volume?

Not necessarily. Contour and three-dimensional volume describe different properties.¹,²

Must the lower lip be larger?

A ratio from an experiment is not a personal requirement. Consider what was measured and in which population.⁴

Can a selfie measure volume?

A two-dimensional photograph alone is not a clinical measure of three-dimensional volume.³,⁶

Continue with facial attractiveness or return to the English guides. MBV’s analysis is illustrative and does not diagnose a condition or recommend treatment.

References

1. Luthra A. Shaping lips with fillers. J Cutan Aesthet Surg. 2015;8(3):139–142. doi:10.4103/0974-2077.167269. Full text

2. Wu SQ, Pan BL, An Y, An JX, Chen LJ, Li D. Lip morphology and aesthetics: study review and prospects in plastic surgery. Aesthetic Plast Surg. 2019;43(3):637–643. doi:10.1007/s00266-018-1268-x. Abstract and bibliographic information

3. Sforza C, Grandi G, Binelli M, Dolci C, De Menezes M, Ferrario VF. Age- and sex-related changes in three-dimensional lip morphology. Forensic Sci Int. 2010;200(1–3):182.e1–182.e7. doi:10.1016/j.forsciint.2010.04.050. Abstract and bibliographic information

4. Popenko NA, Tripathi PB, Devcic Z, Karimi K, Osann K, Wong BJF. A quantitative approach to determining the ideal female lip aesthetic and its effect on facial attractiveness. JAMA Facial Plast Surg. 2017;19(4):261–267. doi:10.1001/jamafacial.2016.2049. Full text

5. Heidekrueger PI, Szpalski C, Weichman K, Juran S, Ng R, Claussen C, et al. Lip attractiveness: a cross-cultural analysis. Aesthet Surg J. 2017;37(7):828–836. doi:10.1093/asj/sjw168. Abstract and bibliographic information

6. Fioravanti KS, Mengoa MGR, Paludetto LV, Murayama GYA, Oliveira TM, Sforza C, et al. Comparative analysis of lip morphology in Brazilian caucasian individuals between 20 and 50 years old using stereophotogrammetry. Oral Maxillofac Surg. 2025;29(1):57. doi:10.1007/s10006-025-01349-z. Original article

7. American Academy of Dermatology Association. 7 dermatologists’ tips for healing dry, chapped lips [Internet]. Rosemont: AAD; [accessed 7 Oct 2026]. Institutional guidance. Original guidance

8. Czumbel LM, Farkasdi S, Gede N, Mikó A, Csupor D, Lukács A, et al. Hyaluronic acid is an effective dermal filler for lip augmentation: a meta-analysis. Front Surg. 2021;8:681028. doi:10.3389/fsurg.2021.681028. Full text

9. Lugović-Mihić L, Pilipović K, Crnarić I, Šitum M, Duvančić T. Differential diagnosis of cheilitis – how to classify cheilitis? Acta Clin Croat. 2018;57(2):342–351. doi:10.20471/acc.2018.57.02.16. Full text

10. US Food and Drug Administration. Dermal fillers (soft tissue fillers) [Internet]. Silver Spring: FDA; [accessed 7 Oct 2026]. US regulatory source. Original guidance

Educational information. This English edition is an editorial adaptation of the Portuguese guide, retaining the cited sources and their limitations. External specialist review has not been attributed. For corrections, contact contato@mybestversion.com.br.