I'm not sure why that would be necessary....
for blocked ducts, I've always done hot compresses, round-the-clock nursing/pumping, and massage. The only time that didn't work, I ended up filling the bathtub with insanely hot water and dipping my breasts in for a good halfhour. At the next nursing session, the milk came flying out and all was well.
Good luck. Blocked ducts are AWFUL.
(((hugs)))
Kimberly