I had the same problem regarding sulphur gas smell in one of our bathroom sinks. One area to look at is the overflow opening in your sink. This is the little hole at the top of you sink. This overflow opening directs water to 2 small holes located in the primary drain. Often times even though you pour some brand of drain cleaner into you sink these holes are not flushed out resulting in an accumulation of hair and other debris catching in these small drainage holes which in my case caused this sulphur smell. I took a cup of bleach and poured it into the hole at the top of my sink flushing hair and debris out and the smell was gone. It is a simple fix that my address your problem. Good luck!
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