I have had 3 days of pain in my left breast & it's only the nipple that is reddish & hurts. Only one nipple hurts and is reddish the other one is normal. I don't use any harmful soap or any tight bras that would cause this. Im just worried it might be something else like cancer or serious infection? Anyone that has had something similar to what I am going through or who went through the same thing? Thank you in advance!