My go-to resource for evidence based breastfeeding protocols is The Academy of Breastfeeding Medicine.  Physicians tend to respect information coming from other physicians.  ABM has a mastitis protocol that includes information about abscess with the recommedation that breastfeeding continue after drainage.

http://www.bfmed.org/Resources/Protocols.aspx

Laura Spitzfaden, LLLL, IBCLC

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