Spider veins are tiny, thin veins that can be seen very close to the skinâs surface. They look like red, blue, or green spider webs just beneath the skin. Sometimes they are also described as looking like marble. Spider veins are caused by a backup of blood. These become nonfunctional, âdead-endâ veins.
While the fairy fly is the worldâs smallest insect, there a few runners up! For example, the feather wing beetle is only .25 millimeters long. Some scientists think these beetles may even be smaller than fairy flies, but for now, the fairy fly is considered by many to be the âsmallest insect!â.
Bed Bug - (Cimex lectularius) Bed Bug - (Cimex lectularius) The tiny, wingless Bed Bug invites the whole family to feast on people when they're down and out. View All Images (3) Staff Writer (5/20/2016): Although it is best known for its ruthless biting on slumbering humans, the Bed Bug is a parasite of birds and bats as well.