Nipples...

So something that I’ve kinda been wondering for awhile... so my nipples like in the dead center of both I kinda see this “white” area? Idk if it’s like skin or just part of my nipple or if it’s normal or what. It’s not liquid or anything like that. I’ve had it basically all my life and have had multiple breast exams at my gyno and he didn’t say anything was out of the ordinary . I might not be explaining it well but idk how else to explain it ... but is that normal?