There are a lot of arrows pointing to the problem...they aren't listening, either
I know you like to stay relatively close to home but have you thought about
one of the bigger teaching hospitals in the US? At least for a consult? You aren't getting answers so it may be your next step.
I was always told that skin tags shouldn't be removed, when you have an IBD, since healing is an issue. Obviously you are experiencing that:-(
I hope you find some relief, soon!!