C.A.
I would definitely NOT use anything such as a feminine powder or spray.
I had the same issue and what seemed to help me was:
1. Washing it with soap and water and blow drying it on COOL (no heat) until completely dry AND
2. Folding some of those non-stick TELFA pads up in such a way and putting them over the incision so that that they kind of keep the skin folds from touching.