I'm having dermapen treatment. What type of cream or serum can I use for aftercare? (Photo)

I am getting a dermapen treatment done on my abdomen to help with the texture of stretch marks. I was advised to use hyaluronic acid, but I'm not sure what the appropriate ratio/ percentage to use. What are some serums or creams I could purchase for aftercare? The medspa that I go to does not sell any post-op products. Also, I was told they are going to go pretty deep and to expect bleeding. Any advice is appreciated! Please give specific brand names & places to purchase if possible. Thanks!