Some babies and kids have an allergic reaction to eggs. If that happens, they can’t eat eggs for a while. But the good news is that most kids (but not all) outgrow this allergy and can eat eggs with no problem after they do.

Eggnog. OK, so you’d expect egg and milk warnings for this holiday staple. But those with peanut and tree nut allergies should also be careful, particularly with store-bought eggnog, because there’s a cross-contact risk. It’s not a nut, so it shouldn’t bother you—unless you’re allergic to it.

In adults. An egg allergy is extremely rare in adults. Clinical symptoms in adults almost always begin in childhood or young adulthood, but there are documented cases of adult-onset egg allergies. This occurs as the body’s immune system becomes sensitized to egg and reacts to it.

If you or your child has mild allergy symptoms after eating something containing eggs, taking an antihistamine may help ease the discomfort. But be on the lookout for worsening symptoms that might require medical attention. If you or your child has a severe reaction, seek immediate medical care.

Others find that with age, their allergy symptoms lighten up. That may be because the immune system can weaken with age, and perhaps can’t muster as strong a reaction to the allergen. But as an adult, once you have an allergy, it usually doesn’t go away on its own.

Antihistamines. Antihistamines have been used for years to treat allergy symptoms. They can be taken as pills, liquid, nasal spray, or eye drops. Over-the-counter (OTC) antihistamine eye drops can relieve red itchy eyes, while nasal sprays can be used to treat the symptoms of seasonal or year-round allergies.

Claritin and Zyrtec are popular over-the-counter antihistamines. Doctors consider them safe and effective treatments for minor allergies. Both are second-generation antihistamines. These cause less drowsiness than first-generation antihistamines.