How do I get rid of an ecstasy rash?

A few days ago I took some Ecstasy and a while after I noticed a rash on my arm. And since then its been getting worse, now its on my face, neck, chest, arms, back, legs, stomach, pretty much everywhere. And its real itchy.. So whats this rash mean? How bad is it and how do I get rid of it? Thanks for any help!

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