So I'm 19 now and I've had this for a couple years more or less but it's only in my left nipple - it's especially noticeable after I shower/swim. It's kind of white at first, and almost feels like skin when it's wet, like I can kind of rub some of it off, and when it dries it's more of a yellowish color that is crusty. I had it checked out last year (physical exam, blood test - came back normal - and ultrasound that also was normal) and was told they didn't really know what it was, but not to worry. The other day I kind of flaked a piece off and noticed kind of like a crack where the piece used to be?? It's only really noticeable when I stretch the skin of my nipple, but looks red inside, no blood. It is a bit itchy, which it has been on and off from the start, but nothing too prominent. I'm really worried about the crack especially now, and the feeling that the discharge or skin or whatever the white stuff is is increasing (not sure that it is - could be paranoia) I'm scared to go to the doctor again especially during the pandemic but I wanted to see if anyone had any idea of what it could be??? cause I'm worried that it could paget's disease of the nipple. I have no other symptoms really and other than my areola/nipple looks pretty much the same as the other one not affected.