I have suddenly noticed a green vein going across my chest and my areola. I am due for my period, had a normal breast ultrasound last week.

Watch and wait. You may watch and wait. If there are no symptoms and no more veins appear, you may ignore it. If you have pain, swelling, discharge or a lump, see your doctor.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex.
Get HPV vaccine, if you are under 27 years of age.

Related Questions

I have to schedule a breast ultrasound for a lump I have found. What is the best time to schedule it, before or after my period. Or does it matter?

When it is prominent. As your hormones fluctuate throughout your period, you may get cystic changes in your breasts, which is normal. If the lump you feel is constant, than the time of your cycle will not matter. If the area does come and go, or get bigger at different times of your cycle, then go when it is most prominent-more to assure it is cystic and most likely benign, BEST wishes. Read more...