I have heard it can be normal to have a pea sized lump under your nipple, I have also heard that it is gyno if you do. So I really do not know if you have always had that then you might be more susceptible to gyno then others. You usually want to keep an AI on hand so you do not take a chance with getting gyno. At first your nipples might be sore, or itch, and then they puff up. That is the first signs of it. If you keep an AI and use it, you will be able to control it. Also keep a clean diet, and make sure you do not drink alcohol too much. Also smoking cigarettes can help aggravate gyno as well.