Veins Visible in Breasts?

Hi, lovely ladies! I'm 16 years old. And I am fairly pale. I've been able to see the veins in my breasts before. But now they're a lot more visible. And I can clearly see the circles that the big veins make around my areolas. Also, my breasts, especially around the nipple area, are itchy sometimes. And I noticed a "bruise" close to my left nipple a few months ago. I don't feel any lumps. And it doesn't hurt at all. I was just wondering if any of these things were normal? Thanks!