Wierd rash on my face...?

it itches pretty bad, and I didn't do anything abnormal today. I did work out on a new exercise machine, the cover of the seat smelled wierd and plastic-y, and when I was tired I laid my face on it for some 15 minutes while watching a movie(lol).. could this be why??? I have pretty sensitive skin... and allergies, but like I said, nothing abnormal...|||That could be it, try taking an antihistamine.