As the title suggests, last night and today I've been lactating blood. I had mild mastitis last week, and over the past two days the red marks and tenderness have been there (not sure if it's a second case of mastitis or part of the first?). Then I've noticed blood on my baby's mouth for a few feeds, and I'm 100% certain it's not from the nipple itself - it has to be from inside my breast.

Has anyone experienced this before, and is it serious? Or just part of the breastfeeding fun?