The dilated vessels that make up spider veins may appear as short, unconnected lines or as groups of veins connected in a “sunburst” pattern. They often resemble a spider web or a tree with branches.

In some cases, spider veins may be barely noticeable, while in others, they may cover a large area of skin. Although they can appear on the face, spider veins more often appear on the legs because the pressure on the valves within veins is greater, due to gravity and body weight. Consequently, the veins work harder to overcome these forces.

Spider veins usually are considered medically harmless. Nonetheless, some patients may experience a dull, aching sensation after prolonged standing. In other cases, this discomfort may be more intense and manifest as a throbbing, burning sensation.