Could it be breastfeeding anaphylaxis?
I have never encountered this firsthand. The rash you described seems
unusual. Let us know if you learn more.

https://www.infantrisk.com/content/breastfeeding-anaphylaxis

Julie-Ann Toalston, IBCLC
Connecticut, USA

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> Date:    Tue, 15 Jan 2019 01:06:18 +0000
> From:    Allyson Michaels <[log in to unmask]>
> Subject: rash on the breast
>
> I have permission to post. Second time mother, delivered two weeks ago, at
> 34 weeks. Infant being treated for suspected urinary tract infection with
> Ampicillin and Gentamycin. Several days ago, she developed a fine area of
> redness across the top of her right breast. She complained of itching with
> her let down with both breastfeeding and pumping. Her other breast is not
> affected, nor are the areola and nipple. She denied any change in laundry
> detergent, soaps, lotions, or the soap she uses to wash her pump parts. The
> area of redness is diffuse, not like an area of redness with engorgement or
> mastitis. It is not raised. It began 3 days after infant was started on
> antibiotics. Odd though, it is only with MER. I recommended she talk with
> her OB to start and that she may need to see breast surgeon or derm. I
> wondered about topical hydrocortisone.  She did not have this occur with
> her first child. Any thoughts?
> TIA,
> Allyson Michaels, MSN, RN, IBCLCCharlottesville, VA
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