I've had 5 hernias over years. most recent was 9 months ago. incision is swollen, red purple in color, and super sensitive. what could be the problem?

See the Dr.: To rule out foreign body reaction first place, whatever the options, go see the surgeon...Asap.

Complex issue: Firstly, you may have an infection and need to get the current problem sorted out asap. If you had 5 different operations for the same hernia, you should seek an opinion from a general surgeon with experience in complex hernia repair. Checking with the americas hernia society, and finding surgeons participating in their quality collaborative is a good start. May take more than one operation.