In a nutshell

The palm has characteristic grooves where the skin folds during grasping. These major flexion creases form before birth, rather than being impressed by years of use. Their course and number vary; a single transverse crease can also occur in isolation.

Why does it happen?

The creases form as the hand, skin, and underlying tissue develop. Studies of human fetuses show that many arise at the same time as transient tactile pads, while others arise independently of them.

Frequency

Palm creases are normal anatomy. Certain patterns, such as a single transverse crease, are variants with differing prevalence.

Frequency is a qualitative description, not your individual probability.

Is it normal?

Different crease patterns alone allow neither a diagnosis nor conclusions about personality or the future.

When to seek advice

A single transverse crease present from birth is not itself an emergency. In a child, any additional developmental features are assessed during routine medical examination.

Does this happen to you?

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Sources (1)
  1. Kimura und Kitagawa: Embryological development of human palmar, plantar, and digital flexion creases (opens a new tab)

    Prenatal formation in a study of 160 fetuses.

    Author / institution
    Not stated
    Year
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    Publication
    pubmed.ncbi.nlm.nih.gov

Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research