I am not quite sure what to call what I have had on my skin for the past 11 years. My arms and shoulders have numerous white patches, which at times are dry. But I have been also known to acquire dark patches on my skin at my joints (behind my knees, at my elbows on the inside). It has been recommended that I use Selsun Blue shampoo to remove my dark patches. These dark patches have also grown increasingly under my breasts. It has also been suggested that I not use any cream with coco butter. A couple of years ago, I was placed on medication for these patches, but nothing occurred. Do you have any idea what these contradicting patches on my skin could be. My brother also has it, but his entire back has lost most of its colour. We are both white, with one parent being from Portugal. As children we tanned easily and had olive skin. We have lost a fair amount of color due to the patches. Any clues?????