Unfortunately, one of these became irritated, then infected, and then burst! She had an abscess
and almost died.
The most effective thing I've found (recommended by my gastroenterologist) is MiraLax, which can now be purchased over the counter. It is a powder you mix in a beverage, but unlike bulk fiber laxatives, it actually has something that causes the bowels to move. I put it in juice and there is absolutely no change in the taste of the juice.