This is kind of embarrassing but I want to share how I got a neck rash last year so that other people don't make the same mistake. I was at the mall looking at perfume testers. I usually spray the perfumes on those tester sticks or on my wrist to check the scent. For some reason, I sprayed one of the perfumes directly on my neck. It smelled good!
I walked out of there and went into another store. My neck suddenly started to itch very bad. I rushed to the bathroom and was shocked to see my neck red and covered in hives. I had an allergic reaction to the perfume! I washed my neck with soap and water right there and headed back home. My neck was still itchy so I took a shower to make sure the perfume was gone. It took several hours, but the hives eventually disappeared.
Ever since this incident, I never test perfumes on my skin.