After having a J-pouch for 18 years I have recently had it bypassed and have a temporary ostomy bag, 1/12 weeks out from surgery. The underside of this stoma has gone concave (in) and the top part is even with the flesh. This is recking havoc with a good seal. A convex seal will not seat because the upper part of the seal holds it up. The result is that the enzymes in the stole are eating my flesh alive. Anyone out there experience this, have answers.