Does it ever seem to fill with milk and go opaque? Is there a lump or hard area in the breast? If either of these things is true and it's possibly blocking a duct I might consider popping it. Follow the instructions on www.kellymom.com for bleb and do not push into the chest wall but pick at it away from yourself. However if it doesn't seem to be causing any blockage I would leave it alone. Have you got any local support for latch? Kellymom also has links to the Jack Newman handout and videos on latching. Seeing someone in real life is best though.