Thanks Kmn & marcellus,
I think it might be her trying to bring the milk down. It happens more on one side - the side I have had surgery on, so I don't think it flows as well. And as you say, probably also poor attachment on that side - thanks for those descriptions Kmn, sometimes it does look like lipstick! I have an appt next week with lactation consultant, so hopefully that will help.
Cheers!