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.
I have used Scarfade over the past 14 years off and on for various cuts and even a couple surgeries. I had a horrible two inch cut on my ankle from shaving my leg and now, even 10 years later you can’t see where it was because I used Scarfade Scar Gel. It is important to use it twice a day and be diligent about using the gel until the scar is faded but it is worth it. I have also used Scarfade on my knee after arthroscopic surgery and you can’t see the incisions, the same with my shoulder. When I go in for my final shoulder surgery in March I will again use Scarfade to get rid of the incision marks.