Dermal-K Lotion is a way to put extra vitamin K into your skin to repair damage, specifically the damage that causes spider veins. When a capillary, or tiny blood vessel, ruptures, it bleeds. The escaping blood runs and forms what we think of as spider veins, which can lead to multiple skin problems. The job of the dose of vitamin K is to enter your skin and plug the hole in the tiny vein so that no more blood escapes.