This can cause a visible vein in the breast along with a palpable lump and Because of this swelling, there is more blood and fluid in the area.
If you have visible veins on your breasts, you're not the only one. in your breasts enlarging, making the veins more noticeable than usual.".
It can affect any of the veins in the breast, but most commonly affects those on like a long narrow cord under the skin, which is often red and painful to touch.