Spider (Thread) Veins

What are spider (thread) veins?

Spider veins, also known as thread veins, or by the medical term Telangiectasia, are small, twisted blood vessels that appear in a spiderweb pattern through your skin often on your legs or face.

They are similar to varicose veins but smaller and caused in the same way when a one-way valve in your vein, that help your blood flow back to your heart, stops working properly and your vein swells as blood flows the wrong way.

An example of thread-veins caused by reticular veins.
Figure 1 - An example of thread veins caused by reticular veins. Note the visible reticular vein (blue and running in a vertical orientation) on the right-hand picture and how the veins fan from a central focus. 

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