Spider veins are small-dilated veins near the surface of the skin and measure about 0.3 to 1.0 millimeters in size. They may be red, blue, purplish, or greenish in color. The medical term for spider veins is telangiectasia. Spider veins can develop anywhere on the body, but are commonly found on the face and legs. There are larger superficial veins called reticular veins that may be the source of spider veins.
Reticular veins are 1 to 2 millimeters in size and are the greenish color veins and are often visible on the skin surface. In actuality these veins are in the sub dermal area of the skin and many times associated with spider veins. The Reticular veins transmit high pressure usually from a deepers source to the visible spider vein complex.
The most common pattern of spider veins is located on the lateral aspect of the thigh. Spider veins in this location are related to high pressure in the lateral reticular vein. Treatment must not only be directed at the spider veins, but at the underlying reticular veins as well.
Spider veins can reoccur for many reasons. Usually, there is an underlying cause that is responsible for spider veins. Spider veins are the end result of dilatation of the cutaneous veins. This may occur from hormonal or higher transmitted pressure from the venous circulation.
If the cause of the spider vein is not properly treated, they can easily reoccur. Perforating veins can also cause spider veins to appear.
Even if everything has been done properly to address spider veins and treat them, reoccurrence is always a possibility.
Just as with larger veins, your body has the tendency to reform spider veins once they have already occurred.
Pregnancy with its increased venous pressure and genetic susceptibility, are major factors in the formation of spider veins.