my pit bull had started out with a very faint red circle on her belly now it is a solid red color circle and all lumped what should I do?

Not exactly yay but doesn’t seem all nay either … ? No pus and no suspicious smell other than faint sweet smell. Stitching slowly keeps coming apart from the way it puckers when the joint bent (which unfortunately is most of the time). Pink areas I assume good = alive? What about the white and dark areas?