Sore Breast (bruised); cold chills ?????

Hi

Yesterday my breast became very sore; with red marks on it, sorta like bruising.
I did not lose any milk for the first two pumps but the more recent two has seen a decrease of about three ounces.
As well, I had cold chills throughout the evening and night, and was sweating profusely.

Does anyone know what this is; it feels a little better now; but is still sore.
I am also worried about my supply.

Thank you so much for any insight into this!

Lisa and Hannah