Well, it sounds like you could use a revision.
A colovaginoplasty would take a bit of your large intestine and add an extension to your vagina.
This requires abdominal surgery to "harvest" the colon segment.
Many SRS surgeons will not perform this procedure.
A skin graft could be used in a revision also.
I've not heard of this done, though.
If you'd care to mention the surgeon and why your results turned out so, we'd all be interested.