Crepey skin refers to thin, loose skin that resembles crepe paper, often developing on areas such as the upper arms, legs, and under the eyes. This condition is typically caused by a loss of collagen and elastin, which support skin firmness and elasticity. Over time, skin becomes fragile, sagging, and fine-textured. Crepey skin is commonly associated with aging but can also be exacerbated by sun exposure and environmental factors.