This soap was made at first for dogs that don't smell great and have skin problems. We changed the name to Skin Doktor because people with eczema, psoriasis, acne and human skin problems have seen amazing results using this soap. Skin Doktor is black because it has activated charcoal in it. Activated charcoal is highly beneficial in the treatment of acne and skin problems because it aids in the removal of toxins and removes skin impurities. The soap also contains colloidal oatmeal which is known to moisturize, protect and gently cleanse the skin, while correcting the pH to relieve itchy or inflamed skin. Lastly it contains tea tree essential oil which is antibacterial and helps get rid of impurities that can cause odors.