Venous reflux occurs when the valves that usually keep blood flowing out of your legs become diseased and no longer function as one-way valves. The blood refluxes back into your legs and is basically going the wrong way. The blood is being pushed back into the leg, instead of moving towards the heart for proper oxygenation. -- Also called: venous reflux
The area under the squamous layer of skin where most spider veins are located 0.3 mm to 0.8 mm below the skin level.
The bluish/greenish veins are close to the skin surface. They are usually visible and everyone has them. When there is increased transmitted venous pressure, reticular veins sometimes will dilate or be associated with spider veins.