Wow, Ouch! So, nursing mom's use lanolin which comes in a purple tube and can be bought at any drug store. Was my nipple life saver when I had babes that tended to cause issues like this. But if you have blisters, ugh. If they are filled with pus, double ugh. Try not to pick at it or touch it as bacteria from hands can be transferred. But agree that if this continues and especially if it is painful or if it becomes hot to the touch, I agree with purple that you'll have to make sure you aren't infected. For that, they may give you an antibiotic ointment which you could also try yourself now --- something like Neosporin. Anyway, let us know what happens.
It does sound like there might be an infection going on- I'd have a doctor take a look at it so the infection can be treated as needed. Feel better soon!