First, read the English article below.

If you’ve tried multiple methods for lightening your nipples with no success, visit your doctor to discuss your concerns. They may be able to prescribe a medicated ointment that is safe for short-term use.  Be sure to tell your doctor about any treatments that you’ve tried. While having dark nipples is perfectly normal, don’t be afraid to talk to your doctor about cosmetic treatments for lightening your nipples if it’s something that is important to your self-image. Your nipples should lighten to their original shade around 2-3 months after you give birth or stop breastfeeding. If they don’t, make an appointment to see your OB/GYN, where they may be able to diagnose any underlying causes for the darkness.  In many cases, darker nipples after pregnancy and breastfeeding are due to a hormonal imbalance that can be easily treated. Keep in mind that changes in nipple size and shape during pregnancy are normal and can’t be reversed without cosmetic surgery. While rare, changes in nipple color along with other symptoms can be a sign of certain types of cancer, such as Paget Disease of the Breast. If your nipple is frequently itchy or dry, or you notice a white or yellow discharge from your nipple, make an appointment immediately or visit the emergency room for treatment. A doctor will be able to take a sample of your breast tissue to check for cancer or other diseases. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Nhờ bác sĩ kê đơn một loại kem làm hồng nhũ hoa an toàn. Cho bác sĩ biết nếu nhũ hoa của bạn không hồng lại sau khi mang thai hoặc cho con bú. Đến gặp bác sĩ ngay lập tức nếu nhũ hoa bị ngứa hoặc tiết dịch.