Spider veins are small, often harmless, but undeniably frustrating. And for many people, they create a mix of cosmetic annoyance and curiosity: Why did these show up? Are they signaling something ...

You may have caught sight of them in the mirror, those tiny, branching blue or red lines creeping across your thighs, calves or even your face. Known as web veins or spider veins, they’re small but ...