The effectivity of a skin product differs from person to person and depends also on the skin type. My natural skin is designed to be a bit thicker than the others (i believe) however everytime I got a pimple they are going to be persistent that would really leave a mark on my skin. Few pimples on my skin may look cute since but the mark it left is horrible. As every people would do they will find ways to really get rid of it which I also do. Keeva tea tree oil really works for me. I know this is not the best product on the market for treating acne but for me its simply the best because it works without problem.