The answer to 'my faucet smells bad' is that a smelly faucet is usually caused by bacteria or mineral buildup in the faucet or pipes. This can happen over time, especially if the faucet is not cleaned regularly. Symptoms include a foul, unpleasant odor coming from the faucet.
The good news is that this is usually an easy problem to fix. You can try cleaning the faucet with a mild bleach solution or vinegar to remove any buildup. If the smell persists, you may need to disassemble the faucet and clean it more thoroughly. However, if the issue is in the pipes, you may need to call a professional plumber to inspect and clean the pipes.