Breast milk?

Me

My son is 7 months old. I’m not breastfeeding. I tried at the beginning but it didn’t work. For the past 7 months I’ve had a slow leak from my left nipple only. Still milky. For a while I thought it was normal until today. I started messing with it and felt a lump near my nipple like on the top. I’m not sure what’s going on. So I’m going to make an appointment and find out. Anyone else have this issue?