Thank you for your inquiry.
I am assuming that your skin tests are being performed to aeroallergens. In this case, I would consider allergy skin tests safe to administer during breast-feeding. Although there are no studies in this regard, perhaps the best way to answer your question is to cite a quote from the most recent guidelines (Parameters) on Allergen Immunotherapy, which discusses the administration of allergy injections during breast-feeding. As you know, injections contain the same allergens, but in larger doses than would be administered in skin testing. The above noted quote is copied for you below:
"There is no evidence of an increased risk of prescribing or continuing allergen immunotherapy for a mother while breastfeeding and no risk for the breast-fed child. SOURCE: Cox L, et al: Allergen immunotherapy: A practice parameter third update, Journal of Allergy and Clinical Immunology Vol. 127, Issue 1, Supplement, Pages S1-S55, 2011."
In addition, there is a website here with an opinion from a pediatric neonatologist about this subject that might be helpful to your patient, which also states the opinion that injections of allergen during breast-feeding are safe.
Thank you again for your inquiry and we hope this response is helpful to you.
Phil Lieberman, M.D.