Why does the water from your kitchen sink smell like sulfur but the rest of the house is fine?

Check to see if there is an old water filter under the sink, Somtimes,if they are left to sit for a time,the water in it can become rancid. (something is growing in the tank)If so remove or replace the unit. Or if your water comes from a well perhaps the rest of the house water is filtered and the one faucet is not, When it should be, in that case perhaps installing a filter on it would help.