Being a fair-skinned person (mixed races) with very sensitive skin, I have VERY nasty reactions to things and all of my reactions are big red blotchy things that will show up anywhere (face, arms, and hands usually). I buy additive-free laundry detergent because anything else gives me really itchy hives. Because I also have bad nerves, they spread like crazy when I see them because I freak out. The backs of my hands get covered in a bunch of little red bumps that I can't stop scratching. I've had to leave work early because the itching bugged me so much that I was getting close to a panic attack. The only medication allergy I have that I know of is phenergan and that was given to me via IV and caused a rash that proceeded to cover my entire arm. The promethazine they gave me after got rid of it, but it was definitely no fun.
My mother and sister have really strange food allergies, mostly to fruits and nuts. My sister gets all bloaty and has this constant feeling like there's something in her eye, but my mother itches and gets a horrible sinus thing going. My sister did the allergen test and she's also allergic to everything she tested for on top of having severe Asthma. My allergies didn't even start until I was about 18 or 19, but it was obviously bound to happen with the genes my mother passed to us.