That's actually a really good question because people often confuse the two. Spider veins are typically smaller, closer to the surface of the skin, and appear as thin red or blue lines that can look like a web pattern. They're usually just a cosmetic concern. Varicose veins, on the other hand, are larger, often raised above the skin surface, and can sometimes cause discomfort like aching or heaviness in the legs. From your description of blue lines that aren't raised, it sounds like you're dealing with spider veins. Treatment approaches are indeed different. Spider veins often respond well to laser therapy or minor sclerotherapy, while varicose veins might require more intensive procedures. Your best bet would be to see a vascular specialist or a dermatologist who specializes in vein treatments. They can do a proper examination and recommend the right approach.