Ros, For the very painful white blister at the opening to a milk duct, I
have had good luck with soaking in a solution of epsom salt--2 tsp to 1 c
water.  The es. is first disolved in very hot water then further water added
to warm temp. The epsom-salt soak before each feeding opens the area and is
less traumatic than lancing.  And I believe the es. aids in healing. I
recommend continuing this procedure until the duct is free of the accumulation.

Pat Gima,IBCLC
Milwaukee