Blister/lump on nipple

Hi there! I gave birth to my son 9 weeks ago, and i chose not to breastfeed at all......my question is... My partner bit my nipple a couple of weeks ago, playing around at night (as u do..lol) and i have since then a swollen lump..sort of like a cyst/blister right on my nipple. I am really concerned about it, as it hurts when touched. I have tried to squeeze it (which i have stopped doin by the way) and nothing comes out, it is semi hard. Would any of you know what this could be? could this be a swollen milk duct or something?????? Any help would be appreciated! By the way, i go see my Doc about it next week too...just wanted some feedback in the meantime. Thanks!