01Fixed creases
The neck folds in the same places every time you look down. Over years those folds can stay as lines, sometimes even in your twenties.
How a doctor tellsThe doctor stretches the skin gently. If the line remains as a groove, it is a set crease that needs filling or remodelling.
02Thin, crepey skin
Neck skin is thinner than facial skin and loses collagen and moisture easily, giving a fine, crinkled texture.
How a doctor tellsPinching the skin shows many fine wrinkles rather than one or two deep lines.
03Loose skin and muscle bands
With age the skin under the jaw can loosen, and vertical bands from the neck muscle can show when you tense.
How a doctor tellsAsking you to clench your teeth or grimace shows whether vertical bands appear, and whether skin hangs below the jawline.
04Posture and phone habits
Looking down often deepens the folds. It is not the only cause, but it matters for how fast lines come back.
How a doctor tellsThe doctor will usually ask about your posture and work habits rather than measure anything.