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.
The mottled look seen in a person with livedo reticularis occurs
when some of the blood vessels feeding the skin go into spasm.
Symptoms of livedo reticularis include a mottled, or lace-like,
appearance of reddish blue areas on the skin. The mottling is more
apparent on the thighs and forearms, and sometimes the lower abdomen.