Dermatologists like Rossi think people can skip showers altogether, multiple days per week. This view isn’t unanimous, though ...

Dove says that one of the differences lies in the pH of both products, with bar soap being a lot more alkaline. It explains that that’s why its Beauty Bar doesn’t strip your skin as much.

The terms soap and cleanser are sometimes used interchangeably—but not by dermatologists. Effective cleansers may come in bar form, such as Dove Sensitive Skin, but “this is not soap ...