Dr Davey black soap deep cleansing whitening collagen and charcoal back soap 100g. This is coal with a summary of collagen this soap works to remove blackheads and bleaching and tighten pores and removing acne. The soap helps in the prevention and treatment of rosacea a condition that dermatologists still find difficulties treating. African black soap is great for skin. This is because it has several vitamins, anti-bacterial and anti-inflammatory properties. Other useful components of the soap include antibiotics and retinoid.