Horizontal and vertical neck wrinkles have different causes. Horizontal wrinkles (necklace lines) are primarily caused by congenital factors, repeated bending of the head, skin folding, and loss of elasticity due to an approximately 1% annual decline in collagen. Their prevalence is increasing among younger people as smartphone use rises. In contrast, vertical wrinkles (vertical bands) tend to become more prominent as the platysma, the broad muscle on the front of the neck, becomes tense and loses elasticity with aging.
In other words, horizontal wrinkles are more related to issues in the skin and collagen layers, while vertical bands are more closely associated with muscle movement. If vertical bands protrude when you speak or exert force, the muscle factor is significant; if the wrinkles appear as horizontal indentations like folded marks even at rest, the skin and elasticity factors are more important.
These two types often appear together, and because the approaches differ, identifying which wrinkle type is the main concern is the starting point for a treatment plan.



