Hi Marie! Just a wild guess but I think you are seeing pus in the breastmilk: It would hold together in "slimey clots" until swished around. This degree of pain and swelling just yells for antibiotic. Doesn't matter that she is not yet running a fever. I have seen many cases of breast infection that are afebrile and respond wonderfully to antibiotic. Joanna Koch, IBCLC