The answer to 'my faucet smells bad' is that a foul odor coming from your faucet is usually caused by bacteria growth or a buildup of debris in the aerator or pipes. This can happen over time as water sits stagnant in the plumbing system, allowing bacteria to multiply and release unpleasant smells.
Some common symptoms of a smelly faucet include a rotten egg or sewage-like odor, discolored water, and a slimy buildup around the faucet. The good news is that this is typically a minor issue that you can fix yourself with a few simple steps. However, if the problem persists or you're unsure of the cause, it's best to call in a professional plumber to properly diagnose and resolve the issue.