About telangiectasia A telangiectasia (telangiectases or telangiectasias in plural) is a flat, dilated, red-colored blood vessel visible on the skin or a mucosal membrane, typically 0.5 mm to 1.0 mm in diameter.  Related terms are: venulectasia, which refers to blue-hued vessels, somewhat raised and less than 2 mm in diameter; and reticular veins, which are 2-4 mm… Read More