I'd just get some kind of foundation to cover it, it's probably way more noticeable to you than anyone else.
Incidentally, a while back I noticed two small soft lumps on the underside of my forearm. I mentioned them to the doctor (I'm a known IV user, it's all over my doctors notes), and apparently they are varicose veins. They look nothing like any varicose vein I've ever seen. The lumps are colourless and look and feel like small cysts. But she assures me that's what they are. Also that they are caused by long term IV use. I've never seen or heard of it before.
Six months or so on, they are exactly the same size and I've now developed two similar but smaller lumps on the outside of my left calf which have also been identified as varicose veins.