What is the name of this skin disease?

i cannot find it online, but i have seen it before, i dont think it is very common. this skin disease involves very large bumps all over the skin and it is viral. the bumps may fall off and can be found in bed sheets and clothes. i do not know if they are itchy, but i dont think they are. this disease spreads all over the ENTIRE body, and cannot be treated, once you have these bumps, they're there for life. they're not red, they're skin color. WHAT IS THIS DISEASE CALLED????? someone suggested shingles b4, but thats not it. help! =[