maybe due to blocked ducts. see if you can rub it off or squeeze it out when you take warm shower. but if you have redness nipple, you may need to go to see a doctor to exclude infection.
you can take ordinary panadol for the pain at the moment.
I got the same problem like you when my bb few days old. That time I was in the St. Paul hospital. My doctor gave me : CAMODERM, CHAMOMILE OINTMENT (24g), by Goldshield Pharmaceuticals Ltd. UK. It is a good ointment and you can try it.