My c-section incision got infected. This is not that uncommon. It is, however, very important to treat it right. My OB didn't and I continued to have new sections open up on their own until I was 4 months postpartum. The important thing is to let it drain. The body will naturally want to push the infection out. So it needs to be left open so that it can drain and heal from the inside out. There is wicking material that can be used to help this along, then other materials that can help it heal from the inside out, which is what it needs to do.
My OB's office covered it with Dermabond to try and seal it back up and I ended up with a 4 month infection and tunneling.
You may want to visit the Wound Clinic at Presby Plano. It wasn't until I finally started going there (on my own because I was fed up with my OB's office) that they started me on a program and I finally started to heal.