Anything that foams will dry out your skin. This applies to both foam and foam. But if you dry the skin, you remove its own protective film. Then you end up in a vicious cycle: you dry out your skin, the skin produces more sebum, which makes it clogged and ugly. This is why you continue to cleanse the skin with foam, your skin is attacked and begins to produce even more sebum. The circle is round. Even if you have oily skin, my advice is not to dry out your skin and therefore not to use foam for cleaning.