I got a very quick spreading rash all over my body?

Anonymous
I got home from hanging out and had a radsh on my arms. Only my arms. My mom said it's from my coat cause I was sweating. I went to bed, and got more itch. Looked in the mirror and it has spread so much so fast. I don't want it to come in my face and I'm concerned.

What is this? Whats the cause?
didn't eat anything unusual, or used different shampoo or anything. It is itching like hell and burning a bit and it looks like mosquito bites but like 10.000 of them

Im going to the doctor tomorrow probably or Monday and get an injection but what the fuck is this shit man?

I got a date in a few days an can't have this
I got a very quick spreading rash all over my body?
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