Hypoallergenic

Common allergies means common, not the only-possible-allergies-in-existence.
The term 'hypoallergenic' is a term used by companies that claims to cause fewer allergic reactions.
Fewer, not zero.

There are a lot of terms that are used in advertising that are not beneficial for everyone (just like anything else).
Terms like 'hypoallergenic', 'all natural', 'naturally occurring', 'naturally derived', 'plant-based' are all potentially fantastic sources... but it still might not be appropriate for everyone.

If I am trying something new - like beauty products, skin care products, food, or even makeup - I always like to look at the ingredients. For good reason.
I find it comical when I ask to see ingredients due to allergies and someone says "well, it's hypoallergenic so you should be fine".
Natural ingredients, like caffeine, willow bark, fennel, star anise, licorice root, etc... still give me an allergic reaction. Other common ingredients in skin care, makeup, and facial cleansers include salicylic acid - which I am also allergic to.
Hypoallergenic pillows might not be good for me either if the foam has any traces of rubber.

Just a reminder that 'hypoallergenic' means fewer allergic reactions, which covers many common allergies, but try not to scoff at people like me who still insist on reading the ingredients. I don't like hives any more than the next person, and all natural sources does not necessarily mean better.

Be wary of specific terms in advertising.