Aah, ni normal je! Those are Montgomery's glands (atau sebut je "oil glands") yang ada kat areola, function dia to keep the area lubricated and protected, especially important kalau you're breastfeeding. A few of my mum friends experienced the same thing, especially during pregnancy or when hormone changes happen, so don't worry lah. Tapi kalau suddenly rasa sakit, or ada discharge yang pelik color/bau, or bukit-bukit tu bertambah banyak or bengkak, better check with your gynae or GP just to be safe, okay?