I use the dudu osun black soap for my face and body. I use it on my face with my clarisonic and it dries my skin out. My skin isn't exceptionally dry normally but I have combination skin, if it dries out the faces of people with oily skin then if you already have dry skin it will definitely dry it out.
It isn't that bad though, people really go crazy like your face cant be re-moisturised. I picked up a regular day cream from Nivea and that gets my face back to normal after using it.
Sn. I'm assuming you're using it for dark spots and to even skin tone? I have been using it for about 6, maybe 7 months once a day, 6 days a week. It hasn't evened my skin tone in the slightest but because of it's drying aspect it dries out any spots that may have popped up and stops new ones from coming.