Why did I suddenly get an itchy, bumpy rash on my arms and torso?

Why did I suddenly get an itchy, bumpy rash on my arms and torso?

Don’t say go to doctor as I don’t have health insurance and lost my job.
move been itchy on my arms, stomach and back, butt , with bumps. Why? I’ve been scrubbing in shower with a loofah all over these areas. Nothing else I’ve done.

Why did I suddenly get an itchy, bumpy rash on my arms and torso?
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