Blue and black nipples? Breastfeeding?

I have been breastfeeding for 5 months. I can use liners because the baby had problems breast. Occasionally I have some nipple pain that lasts a few days every time the baby feeds on that side. Good Nite past, while the fed baby on the one hand I am in severe pain. does not have teeth, but the impression he bit me. This morning, I noticed two small black and blue marks on the tip of the nipple look like someone took a pen and made two small marks. Is this normal and there is nothing you can put on your nipples to relieve pain?

I had the same problem with my son, because when I gave birth to the nurse told me I had to use a nipple shield because my nipples were fixed (including a lactation specialist said was not true), but after my son would not be without a nurse, so I continued to get strong pain in the nipple and bruises which was an infection and will not go away as I was using the shield, so I had to stop breastfeeding when my son was 4 months, I think you should talk to your doctor who may be an infection or can be

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