Black soap is great for clearing up your face, and making it smooth but you gotta be careful with it, because some brands are really harsh and will damage your face if you scrub too hard or leave it on too long. They have acidic ingredients like lemon juice and etc in them.
One day I decided I was gonna lather up the black soap first and shampoo my hair before I rinsed off the black soap
, never again. The black soap stay on my body for too long and irritated my skin bad. This was right before bed too, to my skin was burning all night dude. But I use shea butter as a mosturizer and after two days when the irritation stopped my skin was so smooth and nice feeling. Some girl told me the burning means the soap was working on my skin and causing the skin cells to die and regenerate quickly and the shea butter only helped that process. But still I rather not experience that again.