If you have a nut allergy, you're probably already careful about the foods you eat. You might also avoid foods that are processed in plants that also handle peanuts, pecans and other nuts. But have you thought about what's in your makeup bag?

A couple of readers have e-mailed me recently, sharing horror stories about having allergic reactions to creams and lotions. The culprit, of course, was nut oil. Because so many nut oils have beneficial properties—for instance, argan oil has excellent anti-inflammatory properties—they're frequently used in everything from hair oil to lip balm. Unfortunately, while they provide benefits to some people, they trigger allergies in others.

Those of you who have nut allergies probably already know to read the labels, but just in case, watch out for ingredients such as shea butter, almond oil, argan oil, and macadamia oil. Additionally, if you're giving gifts to someone who has a nut allergy, keep an eye on the ingredient list—and leave the nuts for roly-poly little squirrels.