Hello: A normal nipple is a cone-shaped protrusion with a hole, with a diameter of about 1 cm and a height of about 1.5-2 cm. Dark, but it varies from person to person. Unmarried and infertile women have relatively small nipples.
Suggestion: If the nipple does not protrude, it is considered to be caused by the nipple depression. This condition can also be treated with moxibustion and smoked abalone. You can buy a nipple depression appliance for treatment, and the effect is still relatively good. Usually also need to pay attention to nipple hygiene, nipple is also a sensitive part of women.
Wish you good health.