In general, the port incision takes the longest to heal. But if there is redness and it's hot to the touch you could have an infection and should have it checked out by a doctor.
I didn't have an infection but my port incision took about 3 months ot heal fully and even after that I could feel twinges around the port area. The port is stitched to the muscle wall and as you move around, especially when you start to exercise you will feel it pull and there will be little tweaks and twinges because it's pulling on that muscle.
If you think you have an infection or there is actually puss oozing, don't take chances. Have it checked out.