I am a 21 male and I just discovered one of my nipples is inverted and wasn t before. I sit possible that I have a tumor or cancer?
Mostly not, u can't have cancer, that's not your age. Inverted nipples is a common finding in unmarried females. But try to retract it manually as that may create problems during breastfeeding. U can use inverted novel cut syringe, or a breast pump for the same.