What causes redness and swelling in left nipple?
Infection of the breast
Thank you for contacting HCM with your health care concerns
From you description and the image you submitted it looks like you have an infection. This infection could have happened spontaneously. I think you need to see a medical provider today at an urgent care center so you can be started on antibiotics. If you decide to wait this infection could become worse. I recommend you do not delay getting treatment.
We can not prescribe medication from this site. You will need to see a medical provider
I hope I answered your question. Please contact me again with your health care questions and concerns
Typicall antibiotic would be bactrim DS
My first agent of choice for cellulitis would be Bactrim DS and if you were allergic to sulfa then a cephalosporin like Keflex would be my second choice. Your medical provider may have other options but any than treats cellulitis would be appropriate