We installed a new bathroom when putting in a new addition to our home. After using the shower, there is an odor like sulfar smell. We had our plumber back and he snaked a line through the "stink" pipe and came up with a little bit of hair nothing really blocking the pipe. Would you have any idea why the smell is not escaping through the stink pipe versus our shower and if you have any recommendations. Thank you.

Did the original plumber install Trap under your shower pan ?

Take a flash light and shine it into the shower drain. See if you have standing water there... Back to you... Milo