What causes a symmetrical rash of little raised bumps that are itchy in little patches on wrists arms knees and back of knees?

Answer 1

I had the symmetrical rash on the back of my knee which lasted for about a month. It turned out to be shingles. It didn't itch that much until I went through the healing stage on the last week. Then I couldn't scratch enough. The first three weeks however turned out to be painful to the touch, but the pattern looked pretty cool, I could count the dots both across and down, and they matched in number both ways. What I'm having a problem with now is random NON ITCHY red dots and blotches on my left arm. I have had it for a year now, and it never itches. Sometimes a dot would appear and the only way I know its there is because I have blood on my clothes. Once in a great while, one would surface and break the skin. Again, I have no other sympton that it was there except visually. On some occasions, I develop a cluster of blotches that form an interesting symmetrical shape, all within the same size and color. I went to a couple of doctors who told me different things. I had my blood drawn and tested for a full panel on my platelettes, colesterol, blood sugar, thyroid, diabetis, everything. No one can tell me anything at all that can be corroborated through pictures online etc.