Skin & Hair · Anatomical variationThe creases were there before birth
The major flexion creases of the hand form during development in the womb.
Frequency: CommonAnatomical variation
Skin & Hair · Anatomical variation
Eyes · Anatomical variationIris heterochromia
Different iris colors or rings of color in one person.
Frequency: Varies by individual
Ears · Anatomical variationDarwin’s tubercle
A small thickening on the upper outer rim of the ear.
Frequency: Varies by individual
Muscles · Anatomical variationAbsent palmaris longus
A slender forearm muscle with a long tendon toward the palm is absent in some people without loss of function.
Frequency: Varies by individual
Bones & Joints · Anatomical variationJoint hypermobility
Joints reach unusually large ranges of movement.
Frequency: Varies by individual
Whole Body · Anatomical variationVisible hand veins
Superficial veins stand out clearly on the hands or forearms.
Frequency: Common
Bones & Joints · Anatomical variationA curved little finger
A congenital sideways curvature often affects the little finger.
Frequency: Varies by individual
Eyes · Anatomical variationDouble row of eyelashes
Extra eyelashes grow from the openings of the Meibomian glands.
Frequency: Rare
Ears · Anatomical variationAttached earlobes
Earlobes that meet the cheek without a distinct free lower edge.
Frequency: Varies by individual
Muscles · Anatomical variationAbsent plantaris
A variable small calf muscle that is absent in some people.
Frequency: Varies by individual
Skin & Hair · Anatomical variationFreckles
Small genetically influenced pigment spots that darken in sunlight.
Frequency: Varies by individual
Bones & Joints · Anatomical variationAn extra bone in the foot
An additional bone fragment may lie at the inner arch of the foot.
Frequency: Varies by individual
Skin & Hair · Anatomical variationMole
A circumscribed spot made of a cluster of pigment-producing cells.
Frequency: Common
Bones & Joints · Anatomical variationTwo toes share a skin bridge
Adjacent fingers or toes can be partly joined from birth.
Frequency: Varies by individual
Bones & Joints · Anatomical variationThumb hyperextension
The thumb can bend far backward at its end joint.
Frequency: Varies by individual
Skin & Hair · Anatomical variationHair whorl
A spiral growth pattern of hair on the head or body.
Frequency: Common
Mouth & Throat · Anatomical variationGeographic tongue
Smooth red patches move across the tongue.
Frequency: Varies by individual
Skin & Hair · Anatomical variationWidow’s peak
A V-shaped hairline in the center of the forehead.
Frequency: Frequency unclear
Bones & Joints · Anatomical variationThe kneecap has two parts
An additional bone part can remain permanently connected to the kneecap.
Frequency: Varies by individual
Mouth & Throat · Anatomical variationFissured tongue
Deep grooves divide the surface of the tongue.
Frequency: Varies by individual
Internal Organs · Anatomical variationLactase persistence
In some adults, the enzyme that breaks down milk sugar remains active.
Frequency: Varies by individual
Skin & Hair · Anatomical variationPoliosis
A localized white section of hair caused by absent pigment.
Frequency: Frequency unclear
Mouth & Throat · Anatomical variationTorus palatinus
A hard bony protrusion sits in the middle of the hard palate.
Frequency: Varies by individual
Skin & Hair · Anatomical variationCheek dimples
Small indentations in the cheeks, especially when smiling.
Frequency: Varies by individual
Nose · Anatomical variationNasal valve collapse when inhaling
In some people, the soft nasal wall pulls inward during inhalation. This can restrict airflow on one side.
Frequency: Frequency unclear
Mouth & Throat · Anatomical variationSplit uvula
The uvula is split at its tip.
Frequency: Varies by individual
Skin & Hair · Anatomical variationCleft chin
A midline notch or indentation on the chin.
Frequency: Frequency unclear
Skin & Hair · Anatomical variationAccessory nipple
An additional small nipple along the embryonic milk line.
Frequency: Varies by individual
Skin & Hair · Anatomical variationKeratosis pilaris
Small rough bumps form when plugs of keratin collect in hair follicles.
Frequency: Common
Skin & Hair · Anatomical variationMilia
Small keratin-filled cysts lie just beneath the skin surface.
Frequency: Common
Mouth & Throat · Anatomical variationTonsil stones
Small, firm plugs can form in the crypts of the palatine tonsils.
Frequency: Frequency unclear
Skin & Hair · Anatomical variationCherry angioma
Benign vascular bumps appear as red to purple spots.
Frequency: Common
Skin & Hair · Anatomical variationKeloid
A keloid is excessive scar tissue that grows beyond the original injury.
Frequency: Varies by individual
Skin & Hair · Anatomical variationLeukonychia
White spots or lines in the nail plate.
Frequency: Common
Mouth & Throat · Anatomical variationScalloped tongue
The sides of the tongue can rest against the teeth in a wavy outline.
Frequency: Frequency unclearSurprisingly quiet here.
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