I have a seroma post op 4 weeks abdominoplasty it is leaking continuously from incision line, is this normal? (Photos)

Your question indicates you are most worried about requiring further surgery if the involved area is necrosis and not scabbing. While the photos seem to indicate that necrosis is the more likely diagnosis, I am encouraged at the progress you are making. The size of the affected area is...

You are obviously having a healing issue.   Your wound is clean and should heal fine with correct wound care. A wound vac is expensive and doesn't see to be necessary at his point, by looking at your photos.  

All of the answers here are good. Normally those sites close & stop draining within a couple of days of drain removal. As long as no increased pain or fever, probably just gentle cleaning & coverage as suggested. Good idea to have your surgeon/staff take a look & make sure not infected, but...