What is this?

All thought the day I noticed that my left breast felt sore (more so around a certain spot) After DD's last nursing session it got worse so I looked in the mirror and underneath my nipple is a small red bump (about the size of a pencil eraser.) It hurts to touch, or if even my clothes touch it and it is uncomfortable when DD nurses on that side. It sort of reminds me of a blister, but there is no head. What could this be?

Mastitis maybe?

my lc said mine was a blocked duck and to just keep nursing. I still have it and it looks like a skin tag almost but hard. for a few days while nursing it had a little sore. hurt so bad. it stoped hurting after 3-4 days.
Does it sound anything like that?

I agree.. sounds like the start of either Mastitis or a clogged duct. Warm compressed help and MASSAGE, MASSAGE, MASSAGE. If the pain gets worse you may need medication to control the infection.

Quoting furrbabiesmommy:" my lc said mine was a blocked duck and to just keep nursing. I still have it and it looks like a skin ... [snip!] ... few days while nursing it had a little sore. hurt so bad. it stoped hurting after 3-4 days. Does it sound anything like that?"

Yeah, it sort of does.

Quoting ~Cullen & Ridley's Mommy~:" Yeah, it sort of does. "

just keep nursing. I put a dap of neosporin on it. seemed to help wit the pain.