Why socks cause indentations?

Socks can cause indentations in the skin due to the pressure they exert on the underlying tissues, particularly if they are tight or made of elastic materials. When the elastic fibers compress the skin, they temporarily restrict blood flow and create a mark that can persist for a short time after the socks are removed. Additionally, the indentation may be more pronounced in areas where the fabric is thicker or has more elastic material. These indentations are generally harmless and resolve quickly once the pressure is relieved.