black knees and the cream should b free of any side effects (like hydroquinone which causes cancer). i have acne on my arms and have dandruff(scaling)....black knees and the cream should b free of any side effects (like hydroquinone which causes cancer). i have acne on my arms and have dandruff(scaling)....black knees and the cream should b free of any side effects (like hydroquinone which causes cancer). i have acne on my arms and have dandruff(scaling)....black knees and the cream should b free of any side effects (like hydroquinone which causes cancer). i have acne on my arms and have dandruff(scaling)....black knees and the cream should b free of any side effects (like hydroquinone which causes cancer). i have acne on my arms and have dandruff(scaling)....