Is bepanthen plus cream ok to use on my wound? (Photo)

I had breast reduction op. 4 weeks ago, 5 days ago the insicion opened up and is getting bigger, I've been told by my surgeon that this is normal and has to get worse before it can heal, he removed the stitches and said this will help the healing,, he said its not infected. i have been cleaning it daily and using bepanthen plus on the wound to keep it moist, but I've read that antibiotic creams can give an allergic reaction and slow down the healing.. how do I dress this wound?

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