Why do I have a Big Blue Vein on One of my ? & my is Sore?

Well my get sore during my period so you might be going through that. Veins are common on s and can go away with time as you grow or stay there permanently. Stretch marks are also common as they grow, u can try and help this with a nice vitamin e cream or anti stretch creams but as the get bigger so will the marks. IF you experience an extreme growth spurt this could b the cause of the stretch marks.