You may have heard that working up a rich lather is the best way to thoroughly cleanse your skin. The truth of the matter is that you don't need a cleanser with a foamy lather to get good and clean. In fact, the materials used to make soap sudsy are often just detergents and surfactants, which break up the oil that dry, sensitive skin desperately needs.
If you've got very oily skin, this might seem like a nonissue. That cool, clean polish you get after lathering up can feel wonderful after a day of dealing with a greasy face. But when you overuse these cleansers, they will ultimately hurt your skin's ability to defend itself.
And what about the classic sudsy soak? Sorry, bubble bath lovers. Bubble bath formula is mostly just detergent and scent -- it's designed to foam up prettily, not to go easy on sensitive skin.