Hey!
that happened to me too! I could actually see my stitches. I was freaking out.
If you do a search, I bet you'll find my posts called 'freaking out'.
And that's basically what my stoma nurse told me.
I was a pain to get it to heal, but it did. I didn't change my bag more often, but I did get better products that didn't leak. and I put on lots more paste.
And I tried to give it as much air as possible. Right b4 bed time was best for me. But I have an ileostomy, so I bet that'd be easier for a colostomy.