In late 2010 I started to have very large painful flare-ups that would rupture after about a week. I eventually had that PS removed in March 2011 and it was a closed wound (stitched up). I recovered fully from that surgery in about 6 weeks and had no flare-ups for about 2 1/2 years.
Now I am currently suffering through another one of these flare-ups, though thankfully it is much smaller and less painful this time. It ruptured earlier today and I am feeling great pain relief. I went to my family doctor earlier today and was referred to a general surgeon to see about having another surgery (open wound this time) to hopefully remove this thing for good.