Why are my breast lift scars spreading?

It is always hard to offer advice or explanation without enough information, and in this case photos would be helpful. As to the permanent suture, you should be able to feel it yourself--a circular band usually right at the outer edge of the areola.A common reason for failure is untying or breaking of the suture. When the tension is great enough, the suture can pull through the tissue and allow the areola to spread even though the suture itself remains intact.All the best. 

A Benelli lift has the downside of having too much tension on the suture line and even with permanent sutures, can lead to spreading scars and a flatter look to your breast.