Im really worried about my brother. His skin has turned black over most of his left forearm, not quite a scab but thicker than normal skin. There are also large half dollar size spots on his right arm. This is how it began on his left arm and they grew together into a large black area. In some areas of the left arm I can now see where there are white splits in the black areas. They don't break the skin, but the black is pulled apart, like the black slightly pulled apart. On the entire left side of his neck and up to his jaw line the skin has blacken UNDERNEATH the skin - like a deep shadow under the skin. This is the best discrition I can give. I've look all over the internet and haven't seen a picture of what I discribing. Please help.