Long periods underwater or exposure to running water can make the scabs or softened new skin fall off. This prolongs the healing process. Immersion in cold water for more than a minute or two slows down blood flow, which in turn slows down scar healing.
This stuff is amazing. I’ve had some pre skin cancer spots removed with stitches. The first one I did not know about Scarfade and the second one I did and what a difference from the first scar and the second. This stuff is great to have on hand even for the little cuts you might get.