Palm lines are flexion creases — folds in the skin that form where the hand bends. They begin forming before birth, influenced by fetal hand movements. After birth, they continue to develop in response to how the hand is used, how the skin ages, and changes in underlying tissue.
The skin's collagen and elastin network shifts over decades: lines deepen, new fine lines appear, and some shallow marks fade. Occupational use, body composition changes, certain medications, and health conditions affecting skin can all alter the line network.
None of these causes are mystical. They are the same biological processes that create wrinkles on a face or calluses on a foot.



