Veiny red bump

I'm nineteen years old and when I was young I matured very quickly. My mother had lazy eye issues and I've noticed that I have gaining eye focusing problems for the past two years. I get migraines from wearing glasses for too many days in a row. Anyways, during my last few years of high school, my friend pointed out this veiny red dot by my left eye and how it got darker if i was sick. It is lifted a very little bit I've also noticed this red dot on the outer edge of my left hand, that isn't lifted at all, for years. There's a red mark (about half the size of a dime) on my left knee. My family keeps telling me it is nothing and for the years that I've know about these marks, I just passed them of as birth marks. Now, this whole visual issue has me worried. Can anyone tell me anything about any of this? I'd really appreciate it.