This sounds to me like a baby who is having to exert a lot of pressure to stay attached, hence the pain, and where I've seen it the cause was a lip tie.  The lip was folding because it couldn't stretch.
Cheers,
Miranda

>Occasionally I see a baby who nurses with what I'd call an over-flanged
>upper lip, where the upper lip is far turned up/outward--no matter how the
>baby latches on.
>When the baby comes off the breast, there is often a half-circle crease
>visible on the upper lip where it was folded up. Usually the mother has
>nipple pain.
>Anybody else notice this? What are your thoughts on it (causes or
>management)?
>Thanks,
>Susan Lawrence in Berkeley

Miranda Buck, RN, (Paeds), IBCLC
PhD Candidate
Mother and Child Health Research 
LaTrobe University
Melbourne

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