When I had my temporary ostomy before takedown, I had a retracted stoma. It retracted deep into its little hole and when stool poured over it, the acidic stool would sit in the recesses, and seep over my skin and under the wafer, causing leaks and many changes of the appliance. I started using concave appliances, and it helped. The one item that healed my bleeding, excoriated skin was Marathon Liquid Skin Protectant. It's by a company called Medline and I believe they sell online, but I also found it in specialty companies that sell health care equipment and supplies.