There is a balm in your coat pocket and another next to the laptop. A third is somewhere at the bottom of your bag. It goes on before the morning meeting, again after lunch, again on the walk home. By nine at night your lips feel tight anyway, and the corners sting a little when you laugh.

The usual explanation is that your lips got used to balm and stopped looking after themselves, so now they need more of it. Or that this particular balm quietly stopped working. Either way the answer is more: reapply more often, or buy a thicker one. The evening still ends with tight lips.

A balm sits on top of your lips and slows down how fast water leaves them. That helps, up to a point. When something keeps pulling water out faster than a thin film can hold it in, reapplying can't keep up, and by late afternoon your lips feel tight again. Usually it is some mix of four things: licking, pulling at flakes, dry indoor air, and the hours you spend asleep.

Why lips lose water so easily

The skin on your lips is built differently from the skin on your cheeks. Its outer layer is much thinner, and lips have almost no oil glands of their own. Your forehead puts out a little oil all day, and that oil slows water loss without you doing anything. Your lips get none of it. Whatever water they hold leaves easily, and nothing comes up from underneath to cover them.

Lips also hardly ever stop moving. Talking, eating and drinking rub off whatever you put on them far faster than anything wears off a cheek. Every sip of coffee leaves a little balm on the rim of the cup.

On top of that come the habits. Licking is the most common one. For a second it feels like relief, because the lips are wet. Then the saliva dries, and your lips end up drier than they were before. Dry lips feel tight, tight lips get licked, and that loop can run all afternoon without you noticing. Sweet or flavored balms make it easier to start, because they give your tongue something to taste.

Pulling at flakes is the second habit. A loose bit of skin is hard to leave alone at a red light or halfway through a long call. Pulling it usually takes some of the skin underneath as well, and that raw patch dries out faster than the rest of the lip.

The air matters too. Once the heating comes on in autumn, indoor air gets dry fast, and office air conditioning does the same in summer. A walk into a cold wind dries lips out within minutes. You can't do much about any of this, but it means your lips lose the most water during hours when you are thinking about something else.

Then there is the night. Plenty of people sleep with their mouth slightly open, especially with a blocked nose. That is seven or eight hours of air moving over the lips, and nobody wakes up to reapply. If your lips are at their worst when you wake up, the drying happened while you slept.

How to tell whether your balm is part of the problem

Start with the balm you already own. Put it on, then spend twenty minutes talking and sipping water the way you normally would. Press your lips together. If you can still feel a soft layer, it is staying where you put it. If they feel bare, you are depending on reapplying, and a balm with a different texture is worth trying.

Check for tingle. A cooling or tingling feeling comes from ingredients such as menthol or camphor. It tells you the ingredient is there. It does not tell you your lips are holding more water, and on lips that already sting it is one more thing for them to put up with.

Check the taste. If a balm tastes sweet, your tongue will go looking for it, and that is how the licking starts.

Match the texture to the time of day. At night nothing has to go on top, so a thicker, creamier layer makes sense. During the day you want something that stays put under lipstick and that you don't mind putting on at your desk. A balm too shiny to wear on a video call stays in the drawer at 3pm, which is exactly when you needed it.

Then think about where it lives, the part that gets skipped. A balm only helps while it is on your lips during the dry hours. One stick on the nightstand is worth more than three in bags you won't open until tomorrow.

Here is a third-party video on the same question, from a channel we have no connection with. It is their view rather than ours, and we are not summarizing what they say in it.

Video: Why Your Lips Are ALWAYS Dry (Dermatologist) / Dr. Usama Syed. Not affiliated with BRAND KR.

Where the REJURAN lip balm fits

A balm earns its place as the layer that goes on before the dry hours begin. The one we stock is the REJURAN Healer Calming Lip Balm. Its product page describes a high-moisture lip care product for dry, chapped lips, with a creamy texture that is lightweight but rich. According to the page, the formula leaves a subtle protective layer that shields lips from environmental stressors, and it goes on smoothly without greasiness. That last point matters if you plan to wear it under lip color.

It comes as a slim twist-up stick holding 3.7 g. The page gives South Korea as the country of origin, and it costs 23.00 USD. Shipping and duties are calculated at checkout.

Who this suits

• Your lips are at their worst first thing in the morning, and you want something by the bed to put on last thing at night.
• You wear lip color most days. The page says the balm can go on before or after makeup, on its own, or layered with lip color, so one stick covers the bare days and the lipstick days.
• You spend your days in heated or air-conditioned rooms and want something you can reapply at your desk without a greasy shine.

Who can skip it

• Your current balm passes the twenty-minute test above, and your lips only bother you after you lick them. Keep what you have and work on the licking instead.
• You want color. The page mentions no tint.
• You need sun protection for a beach day or a ski trip. The page lists no SPF, so look for a lip product that states one.

How to use it

1. Apply it whenever your lips feel dry. That is the page's own instruction, and it sets no limit on how many times a day.
2. Treat the last application of the day as the important one. Brush your teeth first, then put it on right before bed, so it goes onto clean lips and nothing wipes it off before you sleep.
3. Under lip color, put on a thin layer and give it a minute before the color goes on. It can also go over the top. The page allows both.
4. Leave flakes alone. Pulling one tends to take the skin under it too.
5. Skip any spot that is cut, split or irritated, and stop using it if a rash or irritation appears. Both come from the caution section of the product page.
6. Store it away from direct sunlight and high humidity, as the page asks. That rules out a sunny car dashboard and the shelf inside your shower.

What it will not do

It will not do anything for a lip that has already split open. The page is plain about this: do not use it on wounds or irritated skin. A crack at the corner of your mouth that keeps reopening, or lips that bleed, are outside what any lip balm is for, this one included.

Start with two things tonight: a stick on the nightstand, and your fingers off the flakes. A fourth balm in a fourth bag will not do what those two do. If the nightstand needs a stick, the 3.7 g REJURAN balm is the one we would put there.