It may not be advisable to use an additional acne soap along with your current treatment, as it could further dry out your skin. It is recommended to use a gentle cleanser specifically designed for acne-prone skin, which can be found in the cosmetic section of a pharmacy under brands like Avene and LaRochePosay. It's important to try different products to see what works best for your skin, especially when using a treatment like Stieva over a large area of the face.