Crease

A crease is a fold, line, or ridge formed when material—such as paper, fabric, or skin—is bent or folded, causing two parts to press together or overlap. In clothing, creases often develop along tailored lines, giving garments a sharp, neat appearance. In other contexts, like skin, a crease can be a natural fold or line that appears through movement or aging. Creases are typically a natural result of bending or folding, and they can be temporary or become permanent over time depending on the material and usage.