Thanks for your question on Health Care Magic.
I can understand your concern.
Usually veins are not appeared on breast tissue.
But sometimes dilated, green coloured veins running on breast skin are seen in
1.
Viral skin infection of breast.
2. Breast tissue infection
3. Breast mass either benign or malignant.
So better to
consult doctor and get done clinical examination of breast,
mammography,
sonography of breast to rule out major breast diseases.
If all these are normal then no need to worry much.
Apply warm water pad on affected areas, you will be alright.
Hope I have solved your query.
I will be happy to help you further.
Wish you good health. Thanks.