How To Get Rid Of Rash On Forearm And Bump On Face?

i was recently in a car accident where the airbag deployed and i have a rash on my forearm that looks like lil red bumps they remind me of a pimple and there is also some bump on my face but there is no redness and they are very itchy i assuming this is from my air bag but have been unable to find a example picture and over the counter treatment for them other then hydrocortisone