Nipple with white dot

Hi mummy, I need some advise. I’m worry, I realized there is white dot on one of my nipple. I gave birth 8 month ago, and breastfeed for only first month because no milk supply. Now I see the white dot Become a bit slight bigger ? Can I know what’s that? Can I poke? Or which type doctor should I see. I’m worry. Can any mummy advise is this normal ?#advicepls please help#1stimemom