POSSIBLE TMI Lump while breastfeeding?

Rachel • Young mother to two beautiful little girls. 💕
I know that lumps during breastfeeding are very normal, but I thought they went away when you were nursing or pumping. 
I noticed a lump near my nipple but not right on it about a month ago, and it hasn't went away despite pumping every two hours until my breast was empty. It doesn't hurt. Its not red. I know it's not mastitis because I had mastitis with my first. 
I'm just a little concerned because it's not going away. I was going to bring it up with my OB at a follow up, but I had to cancel the appointment because of my daughter being in the hospital and I have no idea when I'll be able to go back. 
The circled area is where the lump is. It's probably just a little smaller than a ping pong ball, but bigger than a pea. 
I'm sure it's nothing, but I kinda need some peace of mind because everything that can go wrong in my life has been going wrong. 
Anybody experience this?