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How to cure a rash asap! Possibly pityriasis rosea? - pityriasis rosea. more condition_symptoms

My first outbreak began as a few small bumps ... the soon to be a skin of millions more through the body: in my neck, my arms, stomach, back and legs. I went to the docotor and regards it as pityriasis rosea.
My Prom comes, and I do not know how I can use my skin by wearing this ugly: (
Please help!

Thank you.