A visit to the salon is supposed to be about pampering and relaxation -- nothing feels better than getting a soft, gentle facial or sitting back in a pedicure chair to have your feet buffed up.

Less relaxing? Some of these treatments can pose serious health dangers, such as fungal infections, cellulitis, scarring and even an increased risk for cancer down the line.

Here's your panic-free guide to nine popular salon treatments, with expert-proven advice on how to stay healthy and beautiful.