Lip eczema is more severe than your average case of chapped lips in the wintertime, but how can you tell the difference? Here, we’re breaking down what you need to know about inflammation on the lips, aka lip eczema, including the signs to look out for, the different types of lip eczema, and how to treat it at home (it’s generally easy to do so). So, how to tell if it’s just chapped lips or something more serious, such as lip eczema? If the skin on the lips becomes significantly cracked to the point of becoming painful, and if no amount of over-the-counter ointments (such as oils, butters, and waxes) seems to help, then you might be dealing with a case of eczema. Cold, dry climates can also exacerbate the symptoms of lip eczema by pulling even more moisture from the thin skin on the lips (second to the undereye area, the lips are the thinnest skin on your entire face). Finally, other common causes of lip eczema include the overuse of lip balm that contains irritating or allergen-inducing ingredients, most commonly artificial ingredients or synthetic fragrance. Board-certified dermatologist Keira Barr, M.D., notes that many ingredients found in toothpaste can have this effect. Or, another sneaky culprit, according to board-certified doctor Alan Dattner, M.D., is traditional nail polishes: The irritating ingredients can trigger contact dermatitis when we touch sensitive areas like our eyes and lips. “The best way to treat and prevent chapped lips is to moisturize, moisturize, moisturize,” Birnbaum says. “However, it is important to choose your lip moisturizer wisely, as some can include allergenic ingredients that can make lip eczema worse.” Instead, Birnbaum recommends seeking out a thick ointment that will help prevent water loss from the skin—the main cause of all forms of eczema, as this happens when the skin barrier becomes weakened or broken. What’s even better: The shorter the ingredient list, the better, as this minimizes the risk for irritation or an allergic reaction. See our list of safe, natural lip balms here, or consider looking for a hydrating ingredient in your kitchen. If that still doesn’t alleviate your painful pout, your best bet, as always, is to book an appointment with a board-certified dermatologist.