Liver disease such as cirrhosis may sometimes be avoided if the person stops drinking alcohol. Spider angioma may be a side effect of estrogen therapy, so could be avoided if the woman does not take estrogen. In normal persons without these risk factors, the cause of the spider angioma is unknown and prevention is not possible.
There are no long-term effects of a spider angioma.
Spider angiomas are not contagious, and pose no risk to others.