Side of nipples having black lines

Hi mummies, FTM here needing your help! I've been pumping the last few days and noticed the side of my nipples starting to have black lines. I'm not sure what it is and it doesn't hurt, but worried if it might be something serious? #firstimebeingamother #adviceplease #concern #firsttimemom

Side of nipples having black lines
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it looks like crevices between bumps on the nipple. how many days are you postpartum? have been latching but changed to pumping recently and noticed this or just gave birth and started pumping then noticed it?

It’s not black lines but pores for milk to exit?