I'm an allergy-prone individual. No, I don't get anaphylactic shocks from peanuts. But I do often get hay fever. I also occasionally find myself reacting to makeup products. The most prominent ingredient being parfum. It sends me into fits of sneezes that can last for the whole day. I am also allergic to other makeup ingredients. The "wrong" lipstick/lip balm can make my lips red, flaky and itchy. The "wrong" mascara/eyeliner can make my eyes extremely itchy and uncomfortable.
It's never a pretty look to be scratching away, especially at your own face. I don't know if you can see it but I've taken a photo of myself after wearing a lipstick that I was allergic to. The reaction was mild compared to some of the past episodes I've had. Nevertheless, it was distracting for me to be "itching away" while I was in class. I've since thrown the product out.
Although I have not isolated a lot of ingredients that I'm allergic to, I've learnt how to test for them.
I would swipe the product onto the inside of my forearm near my elbow (kind of like you're swatching a product). This area of my skin is thin and has some major blood vessels nearby. So if I'm allergic to the product, I get red and itchy within a minute. You can test lip products, mascaras, and eyeliners. I have yet to try it with powder products.
Note though that this will only work if you've been exposed to the ingredient before and have developed an allergy to it. So it is possible that you'll react to the product later on (on the second exposure). In other words, when you're shopping for a makeup product, you test it with this method and you buy it thinking it's all clear but that's because your body has only come across the ingredient for the first time. So when you start using the product, your immune system is already mounted and will then recognise and start responding to that ingredient.
What I'm trying to say here is, this is not a fail-safe technique. It's just a quick and simple way to save you some grief: from buying products that contain ingredients that you are already allergic to. I hope this post has been helpful!
Do you have any tips and tricks for testing for makeup allergies? Please do share!