Livedo reticularis is a disorder in which blood vessels are constricted, or narrowed. It results in mottled discoloring on large areas of the legs or arms.
What is going on in the body?
The mottled look seen in a person with livedo reticularis occurs when some of the blood vessels feeding the skin go into spasm. Anything that decreases blood flow further, such as exposure to cold, will make the condition worse.
What are the causes and risks of the condition?
The exact cause of livedo reticularis is unknown. It is felt to be due to
spasm of the blood vessels. It occurs more often in women, and usually begins when a person is in his or her thirties.