Philtrum
Philtrum.
What the philtrum is
The philtrum is the vertical groove on your upper lip, running from the base of your nose down to the top edge of your lip. It’s flanked by two ridges (the philtral columns) and dips into a shallow valley between them. The bottom of the philtrum sits at the Cupid’s bow — the V-shape at the top center of your upper lip.
Anatomically, the philtrum is a fusion line — it’s where the two sides of your upper lip and palate joined during fetal development. (This is also why cleft lip occurs there when fusion goes wrong.)
It is small. It is also one of the highest-leverage facial features in any rating system, because:
- It’s directly under the nose, in the visual center of the face
- It changes shape with age, sex hormones, and weight
- Its proportions correlate strongly with neoteny and sexual dimorphism
Ideal philtrum proportions
Two measurements matter: length and definition.
Length is measured from the columella (base of the nose between the nostrils) down to the Cupid’s bow:
- Female ideal: ~11–13 mm. Shorter reads as neotenous (juvenile, attractive). Above 15 mm starts to read as masculine or aging.
- Male ideal: ~13–15 mm. Above 17 mm reads as aging.
- Long philtrum (>17 mm): gets called “longface syndrome” in the looksmaxxing community. Hard to fix.
- Short philtrum (<10 mm): rare, looks neotenous to a fault — can read as childlike on an adult face.
Definition is qualitative: the philtral columns should be sharply defined, casting a small shadow on each side. Flat philtrums (no visible ridges, no shadow) read as aged or soft regardless of length.
Why it matters so much
Three reasons the philtrum carries outsized weight:
- Visual center — it’s directly under the nose and right above the most-scrutinized part of the face (the lips). People look there involuntarily.
- Aging signal — the philtrum elongates and flattens with age. By 60, the average philtrum is 3–4 mm longer than at 20, and the columns are blurred. So a long, flat philtrum reads as aged regardless of skin quality.
- Hormonal signal — testosterone elongates the philtrum during puberty. Estrogen-dominant faces keep it shorter. So philtrum length is a clean signal of sex-typical hormonal development.
Female faces rated most attractive almost always have short, sharply defined philtrums. Male faces rated most attractive have longer philtrums (paired with longer overall midfaces), but the columns should still be sharp.
How philtrum relates to the E-line and lip projection
The philtrum is the bridge between the upper lip and the E-line. When a philtrum is elongated, it often pushes the entire upper lip downward and forward, putting the lip in front of the E-line and creating a protrusive profile. When the philtrum is short and the lip rolls outward at the top, the lip sits crisply behind the E-line and the whole upper-lip area reads young and balanced.
This is why some lip-filler patients end up looking worse: filler in the upper lip body pushes the lip out without addressing the philtrum, which can lengthen and flatten the philtrum visually and age the face overall.
Can you change your philtrum?
Surprisingly: yes, more than you’d think.
- Lip lift — surgical procedure that physically shortens the philtrum by removing a strip of skin under the nose. The classic celebrity “where did her philtrum go” procedure. Permanent, ~3 mm typical shortening.
- Lip flip / Botox lip flip — relaxes the orbicularis oris muscle so the upper lip rolls outward, which visually shortens the philtrum by 1–2 mm.
- Filler in the philtral columns — very small amounts of filler can re-define flat columns, sharpening the philtrum without changing length.
- Lip filler (carefully) — filler in the upper lip body can lift the lip and shorten apparent philtrum length, but if overdone it does the opposite.
The classic Gen-Z celebrity lip aesthetic — “small face, defined Cupid’s bow, full upper lip” — is mostly philtrum work, not lip work.
What Fazly does
Your scan measures philtrum length in mm, scores the column definition from the shadow pattern, and reports the ratio of philtrum-to-overall midface. The app separates “your philtrum is long” (bone-driven, hard to fix) from “your philtrum is flat” (often soft-tissue, fixable with grooming or minor procedures).
Sex-conditional scoring applies: a long philtrum on a male face contributes to dimorphism, while the same length on a female face costs points. Both sexes benefit from sharply defined columns.
Track philtrum scores across morning and evening scans — facial swelling, especially from sodium or alcohol, can lengthen and flatten the philtrum overnight by a measurable amount.
/See also
- 01
Neoteny
The retention of juvenile facial features into adulthood — large eyes relative to the face, small nose, full lips, round forehead, short midface, smooth skin. Strongly correlated with female facial attractiveness across cultures. Considered unattractive in adult male faces, which gain dimorphic features through puberty.
→ Read more - 02
Sexual Dimorphism
The physical differences between male and female faces — jaw width, brow ridge, gonial angle, philtrum length, midface length, eye and lip proportions. Driven by puberty hormones. Higher dimorphism (more masculine males, more feminine females) generally scores higher on attractiveness research.
→ Read more - 03
E-Line (Ricketts' Line)
A straight line from the tip of the nose to the most projected point of the chin, named after orthodontist Robert Ricketts. The upper lip should sit ~4 mm behind it, the lower lip ~2 mm behind it. Used by orthodontists worldwide to evaluate side-profile balance and decide if a patient needs jaw surgery, lip work, or no intervention.
→ Read more