Burn First Aid: 4 Steps to Take in the First 20 Minutes

The moment you spill hot soup on yourself, is reaching for ice your first instinct?

This reflex, which many people assume is correct, can actually make skin damage worse.

How you handle the first few minutes after a burn can affect how deep the resulting scar becomes.

What’s the First Step in Burn First Aid?

The first thing to do right after a burn is cool the area under running cool water.
Burn first aid is the process of stopping contact with the heat source and lowering skin temperature to prevent further damage.

The moment skin touches a hot pot or spilled soup, the heat trapped inside doesn’t disappear on its own.
If that heat isn’t drawn out quickly, the damage can spread into deeper layers of skin.

That’s why cooling the burn is the very first thing to do.

1. Run tap water over the affected area for 15 to 20 minutes to cool it down.
2. Keep the water pressure gentle, like a light trickle, rather than a strong stream.
3. Remove rings, watches, and other jewelry right away, before swelling sets in.
4. If clothing is stuck to the skin, don’t force it off—cool the area with water first, then cut the fabric away with scissors.

“Burned skin should be cooled under running cool water for at least 15 to 20 minutes. Applying ice directly can cause blood vessels to constrict rapidly, which may actually deepen tissue damage.”

This is how Korea’s Disease Control and Prevention Agency describes burn first aid on its National Health Information Portal.

Is It Really Okay to Apply Toothpaste or Soybean Paste?

Home remedies like toothpaste, soybean paste, or soju can actually make a burn worse.
A home remedy is a self-treatment method passed down informally, without medical verification.

In the panic of the moment, it’s tempting to reach for whatever’s in the kitchen.
But toothpaste, soybean paste, and potato juice trap heat inside the wound.

These substances can also introduce bacteria and lead to infection.
Pouring soju or other alcohol on a burn is no better.
Alcohol further irritates skin whose barrier is already damaged.

There’s a reason you shouldn’t pop a blister.
Blister fluid acts as a natural barrier that protects the wound from bacteria.

Forcing a blister open is thought to increase the risk of deeper scarring.
Leave blisters intact and keep the area clean instead.

How Are Burn Degrees Classified?

Burns are classified from first-degree to third-degree based on how deep the damage goes.
Burn degree is a classification based on how much of the epidermis and dermis has been damaged.

First-degree burns affect only the epidermis, causing redness and a stinging sensation.
From second-degree burns onward, blisters form and pain intensifies.

However, when damage reaches deep into the dermis, nerve endings can be destroyed, which may actually reduce pain.
Less pain doesn’t mean less damage, so the area should be examined carefully.

When Should You Go to the Hospital Right Away?

Burns on the face, hands, or joints, or burns covering a large area, call for prompt medical attention.
A burn that needs immediate care is one where natural healing is unlikely or there’s a meaningful risk of losing function.

According to a report by The Seoul Shinmun, about 67% of burn accidents in Korea happen at home.
The same report found that infants and toddlers aged 0 to 4 made up 29% of all burn patients in Korea.

Infants and older adults, who tend to have weaker immune systems, can experience wider-reaching effects from even a small burn.
Burns near joints can cause the skin to contract as it heals, which may limit range of motion.

Finishing first aid isn’t the end of the process.
A proper evaluation and dressing from a medical professional can help minimize scarring.

We recommend having your burn assessed at the Burn Treatment page of Ansan Open Surgery Hospital, which has experience treating burns.

Frequently Asked Questions

1. When should you apply ointment to a burn?
Applying ointment while the burn still feels hot can trap heat inside and worsen the damage. It’s best to cool the area thoroughly with cool water, pat it dry, and then apply an infection-prevention ointment.

2. How should you care for a blister that has already popped?
Don’t peel away the loose skin—leave it in place and gently clean the area with sterile saline. After that, protect it with an appropriate dressing and see a doctor to be safe.

3. Why shouldn’t you put ice directly on a burn?
Direct contact with ice causes skin blood vessels to constrict sharply, which restricts circulation and can cause secondary damage similar to frostbite. Always cool a burn with running cool water instead.

References

· Korea Disease Control and Prevention Agency, “Burns,” National Health Information Portal, KDCA. View source
· Ministry of the Interior and Safety, “First Aid – Burns,” Korea Safety (안전24), MOIS. View source
· The Seoul Shinmun, “29% of Burn Patients Are Ages 0–4… 67% Occur at Home,” The Seoul Shinmun, 2018. View source
· Hidoc, “‘Don’t Pop the Blister’… A Surgeon Explains How to Handle Burns,” Hidoc, 2025. View source

This article is intended for general health information purposes only and is not a substitute for individual diagnosis or treatment. If you have symptoms, please consult a medical professional.