Certain individuals are more likely than others to develop broken blood vessels on their face. Specifically, those who have a family history of it are more at risk. An individual's cardiovascular system shares many genetic traits with that of their family. There may be certain genes that increase the chances of facial blood vessels bursting, or of the face becoming suffused with blood at different times. Studies have indicated up to ninety percent of individuals with broken blood vessels on their face also have a family history of the condition. There haven't been many studies into exactly what genetic component causes these vessels to develop. It's unclear whether it has to do with the blood vessel walls, the way blood moves through the body, or the way blood can pool in the face and other portions of the body. Regardless, if an individual's parents or other close relatives have them, they can be fairly sure they're also genetically predisposed toward them. Some steps can be taken to prevent them, but there's no way to guarantee they'll never develop.
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