What Causes Discolouration Of Skin With Tiny Purple Spider Vein In All Over Body?

Hello, for a few years now I have had thick blue spider vein behind the knee in one leg. I am 19, female, 5'2 feet and 56 kg. Recently I started finidng tiny puple spider viens all over my leg up to my thigh even my stomach. Among white stretch marks through my entire body. Also dicolorations and over all pale yellowish undertone (I don't have hypatitis C I checked). I never had any drastic weight loss. I am considered average weight but I think I am a bit heavy. I took birth control for a few months treating hormonal issues. Is there is something wrong with my skin in general?