The archives contain this information, which I have posted multiple times.  A good reference is from a pharmacy journal. I read the article on line.

W Pray:  Consult your pharmacist:  Dermititis causes are diverse, U.S. Pharmacist 2000; 25(8):14-24.

Several salient points of the article:  "The skin normally resists irritation, but some individuals, including...postpartum females...have an enhanced sensitivity."  Further on in the article:  "An underappreciated sensitizer is neomycin, a component of the most commonly sold topical anitbiotic products (e.g. Mycitracin, Neosporin)...Since the appearance of an allergy to neomycin can cause cross-sensitivites with other aminoglycosides, such as gentamicin, the patient should be urged to choose a topical antibiotic free of neomycin."

Barbara Wilson-Clay, BS, IBCLC
Austin Lactation Associates
LactNews Press

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