Herbal soaps, cleansing soaps, and moisturizing soaps contain mixtures of vitamins, herbs, and natural substances that are specially formulated to promote skin health, while most industrial soaps are made in bulk and are generally safe to use.
If you want to change your skin care routine by using herbal soap or other natural products, you should definitely talk to your dermatologist before making the change to make sure that your skin will not have a negative reaction to this change. You may also want to try bathing with your natural soap first before applying it to your face.
If you are sensitive to the product and need to find something different to cleanse your face with then you may have to explore more. If you are buying herbal soap from your local health food store, you can ask the attendant which natural ingredients would be best for your skin, in order to make sure that you are happy with the product.
You have to be careful in selecting the soap. If you take the wrong one you may even suffer from skin diseases. Since the choices vary extremely from person to person depending on your skin its sensitiveness and other requirements you are advised to consult your dermatologist repeatedly, before taking any important decision.