Alcohol allergy?

While traveling and having too many Jameson & gingers, I woke up with a weird rash on my face and felt like shit the entire day. Recently, I drank several blue motorcycles and woke up with a rash on my chest, under stomach, and tops of thighs. I looked it up and the picture sums it up. Another article said it could be caused from sulfur in alcohol. My grandmother was allergic to concentrated sulfur and sulfates. I’ll admit to have done underage drinking and I NEVER had this happen and it’s happened twice within 2-3 weeks apart. Has anyone else experienced this? I’ll probably be going to a doctor soon lol.