Bulging indicates vein dilation. Constant dilation causes vein walls to weaken, leading to further damage. This includes swelling with tissue damage, permanent pigment changes, and even ulceration and/or lymphedema.
Untreated, vein swelling causes fluid with red cells to continue seeping through weakened vein walls. This pooling results in swelling of the lower leg, discoloration, or skin thickening. Tissue damage results over time and may lead to skin break down, creating an ulcer