So... I have a lump on my right breast and I've only heard of that being cancer. I'm currently feeding my daughter on that boob because my mother in law says I could just be full. So I'll post an update after.
Update: it went down mostly and once she fell asleep she pulled off and there was milk in her mouth. The thing is I forgot to mention that I wasn't producing milk before this.
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Could be a blocked milk duct if breastfeeding

Hi Lexi,
I’m also breastfeeding and have had mastitis twice so far (my daughter is 3m old) I’m not saying you have mastitis, I’ve had lumps that disappeared when I kept expressing and feeding.
I would get it checked if it doesn’t go away on its own, otherwise it’s just you producing milk and everything that comes with that, e.g as Natalie mentioned - block duct.

My baby is only 11 days old and I've had lumps everyday since day 6. It's just extra milk for me. The lactation consultant didn't think it was mastitis. She gave me advice on how to ease the discomfort from them when baby is done eating.