Spider naevi are small red marks with a central spot and tiny blood vessels branching outwards like a web, most often appearing on the face, neck, or chest. They are completely harmless, but if you dislike how they look, advanced electrolysis is a quick and effective way to clear them. A tiny probe gently touches the central spot and radiating vessels, delivering a brief pulse of warmth to seal them shut. The redness then fades away as your body naturally clears the treated vessel, leaving your skin looking clear and even.