I wouldn’t wait to go get it checked out. The antibiotics work really quickly, and mastitis can get really out of control if not treated right away (I had to ultimately have breast surgery for an abscess caused by a bad case of mastitis, so from experience, I would definitely recommend not messing around with it! From initial signs to abscess was just a couple of days.). Good news is, the diagnosing and treatment (antibiotics) are a piece of cake and they really knock it out so quickly!
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