What is (are) Phacomatosis pigmentovascularis ?
Phacomatosis pigmentovascularis (PPV) is a skin and blood vessel disorder that is present from birth. Common signs and symptoms include port wine stain and pigmentary lesions, such as melanocytic nevi or epidermal nevi. A variety of classification systems have been proposed for PPV, largely depending on what type of pigmentary lesion is present. Around half of individuals with PPV have systemic disease, meaning that body systems other than the skin are affected. Systemic symptoms can vary greatly from person to person. PPV is not inherited, but is thought to be caused by a genetic phenomenon called twin spotting.