one pore of my nipple is blocked and make a white mark , and when my baby is feeding it's too much pain what can I do , please suggest

A. Hello dear parent! Try applying warm compress on the paining area to reduce the discomfort. If the problem is severe then consult your doctor for a personal evaluation and seek further advice. Eat a well balanced healthy diet and keep yourself hydrated all through the day while breastfeeding your baby. Good luck and take care.