Skin loses collagen and elasticity —two essential components for firmness. As it becomes thinner and less elastic, internal structures, such as veins, become more easily exposed. This process is often particularly noticeable on the hands , an area where skin is naturally more delicate and constantly exposed to external factors such as sun exposure and daily wear and tear.
Anatomy
High temperatures may also explain why veins are more visible at certain times. In hot weather, the body activates temperature-regulating mechanisms, including the dilation of blood vessels .
