Elastic material presses into the skin throughout the day. After the item is removed, a shallow indentation or red line may remain where the fabric sat. On sensitive skin, friction can also cause irritation, itching, or a darker patch. These marks often fade after circulation and the skin surface return to normal.
A garment that repeatedly leaves deep impressions, however, may simply be too small or too tight.A pressure line is not necessarily a bruise. Bruising occurs when small blood vessels beneath the skin are damaged and blood collects in surrounding tissue. It may change from purple or blue to green, yellow, or brown as it heals. An indentation from a sock is caused by compression and may disappear much faster. Watching how the mark changes after the clothing is removed provides useful information.
Swelling can make ordinary socks leave unusually strong rings. Fluid may collect around the ankles after prolonged standing, a long journey, hot weather, or high salt intake. It can also be associated with pregnancy, medications, vein problems, or conditions affecting the heart, kidneys, or liver. A sock mark does not diagnose any of these causes, but persistent or increasing swelling should not be dismissed as a clothing problem.
