HI, recently when i am bathing and after bathing, i notice yellow dirt/stuff clogged inbetween the pores of my nipple(the tip of the nipple) when i tried to use a towel or my fingers to scrap it off, it does come off but appears a little red after that, it keeps coming back even after removing it. There's no pus or any fluid discharge but these yellow dirt/stuff/bits on my nipple is really bothering me. Could it be breast cancer?