Do you still have the itchiness and redness? Do you have any discharge from the incision or fever? Do your symptoms coincide with the use of the new cream? If so, stop using the cream and go back to using what you used before or something very mild with no additives.
In addition, contact your doctor to let him/her know about this. They may want to see you to make sure you are not dealing with an infection. Let us know if you have any additional questions.