At first I experienced a few tiny bumps above my belly button.This was well over a few months ago and the doctor told me it was scabies.The doctor also told me my immune system would kill it. Im starting to feel the same itching, but this time its worse.I also noticed that if i stay up real late and get tired, it triggers extreme itching on my chest,back,thighs,and arms. All of theae body parts dont itch at the same time either, its usually one or two at a time. The itching also leaves bumps that either form in a triangle of a line.What do i have?The itching also last for about 20 minutes