The salt and ice challenge creates a chemical reaction that drops the temperature on your skin to as low as 0°F (-18°C), cold enough to cause frostbite-like injuries within minutes. What looks like a harmless dare actually produces second-degree burns and, in some cases, partial third-degree burns that can leave permanent scars.
How Salt and Ice Get Cold Enough to Burn
When salt touches ice, it dissolves into individual ions that interfere with the rigid bonds water molecules need to freeze. This process, called freezing point depression, forces the ice to melt at a much lower temperature than normal. A 20% salt solution freezes at just 2°F (-16°C), and a concentrated salt-ice mixture can reach 0°F (-18°C). That’s well below the threshold where skin tissue starts to die.
Table salt splits into two ions (sodium and chloride), but the principle is the same regardless of the salt type: more dissolved particles mean a lower freezing point. When this mixture sits directly on bare skin, it pulls heat away from tissue rapidly. The result is a localized cold injury identical in mechanism to frostbite.
What Happens to Your Skin
The injury progresses in stages, and the tricky part is that the ice numbs the skin as it damages it. Most people feel an intense burning sensation in the first few seconds, followed by numbness that masks the worsening injury underneath. This is why participants often hold the ice in place far longer than their tissue can tolerate.
Once the ice is removed, the area typically turns bright red. Over the next several hours, blisters form as fluid collects between the damaged outer skin layers and the tissue beneath. Published case reports describe these lesions as consistent with second-degree burns, where the outer layer of skin is destroyed and the layer underneath is damaged. In more severe cases, the injury reaches partial third-degree depth, meaning some of the deeper skin tissue dies as well.
A documented case involved a 12-year-old girl whose injuries showed clear epidermal necrosis (death of the skin’s outer layer) with blistering. Her lesions were in various stages of healing, suggesting she had attempted the challenge more than once before seeking medical attention.
Why the Damage Often Goes Unnoticed
The numbing effect of ice is the main reason these injuries get worse than they need to be. Because the cold dulls nerve endings in the area, many people don’t realize how badly they’ve been hurt until hours later, when the numbness fades and pain sets in. By that point, the tissue damage is already done.
This delay also means many young people don’t receive any medical care until the injury is visibly serious. Redness, blistering, and open wounds may not fully appear until well after the challenge is over, making it easy to underestimate the severity in the moment.
Permanent Effects
Minor cases heal like a typical second-degree burn, leaving behind discolored skin that may or may not fade over time. More serious injuries carry real risks of lasting damage. Skin discoloration from these burns can become permanent, particularly on darker skin tones where post-inflammatory pigment changes are more pronounced.
Nerve damage is another possible outcome. When the cold penetrates deep enough to affect nerve fibers in the skin, it can cause lasting changes in sensation, including persistent numbness, tingling, or heightened sensitivity in the affected area. The geometric shape of the burn (often a clear rectangle or circle matching the ice cube) can also produce a distinctive scar that doesn’t fade easily, since the cold damage is concentrated in a sharply defined zone rather than spread out gradually.
How These Injuries Are Treated
Medical treatment for salt and ice burns follows the same approach used for frostbite and thermal burns. In mild cases, the wound is cleaned, dressed with antibiotic ointment, and monitored for infection. Published case reports note patients being discharged after wound dressing, suggesting that most cases don’t require hospitalization.
Deeper injuries are a different story. Partial third-degree burns may need care from a burn unit, and healing can take weeks rather than days. Infection risk increases significantly once blisters break open and expose raw tissue. Signs that a burn needs professional attention include blisters larger than a coin, white or waxy-looking skin, numbness that persists for more than a few hours, or any sign of infection like increasing redness, warmth, or pus.
Emergency physicians, pediatricians, and dermatologists have all reported encountering these injuries. When a young patient shows up with a geometrically shaped burn in an unusual location, clinicians are now trained to consider self-inflicted challenge injuries as a possible cause.