Dear doctor, is it possible to be allallergic to beer or alcohol? I get a bad rash on my chest and stomach. I've stopped drinking and its gone.

Yes. But more likely you are allergic to something in the beer than the alcohol itself.
Histamin intolerance. Histamine intolerance refers to a reaction to foods that have high levels of naturally occurring histamine. Wine has high amount of histamine. All alcohol can make dao ( diamin eoxidase) , one of the enzymes that metabolizes histamine in the body, less effective- thus histamine will build up and give you certain reaction. Stay away from alcohol and be careful of highly processed or fermented food.