This does not sound like a galactocoele. A galactocoele is usually bigger, usually *not* painful, although it may have begun in a blocked duct, and is usually deeper. I'm not sure what this is. My inclination, from what you wrote is to open the skin on top of this and express out whatever is there. Afterwards, clean, and apply antibiotic ointment (mupirocin?). Jack Newman, MD, FRCPC