I have had them twice recently. A lactation consultant told me to massage it with olive oil to soften it. Then fill a bowl eith warm water and bend over so your breast is in it. Then massage toward the nipple. Gravity helps. But she did say if that didn't work to use my finger nails to pick at it or a needle. I ended using a needle the second time.
I hope it pops soon for you. The pain relief is pretty instant and you don't want it to go into mastitis!
Vegetarian, CDing, mama to DD (1/09)