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What is wrong with my skin? - measles and itchy skin

I have these little bumps all over his chest and arms. They are really itch and scratch when I noticed a lot, I know that I had crusts. I have psoriasis, but nothing, I think the treatment of psoriasis and psoriatic we are working on, I have tried in these potholes, but nothing happens. such as allergies, measles, scabies?