Dry wall problem

[TDSkaggs]

I hope I am in the right section for this. We bought a house last year and have been working on it our selves. So far things are going good, but we ran into a snag that we are not sure how to handle. We are putting new dry wall in our laundry room behind our washer and dryer. This wall is shared with our bathroom on the other side. There is a sewage vent pipe in of the wall that is making any dry wall we put up bulge out. We need some ideas on how to fix this. Pictures below. Any advice would be most appreciated. Thank you.

Side view of how the pipe sticks out.