Putting a regular ice pack on a keloid can temporarily ease itching and discomfort, but it won’t shrink the scar or stop it from growing. The temperatures reached by household ice (around 0°C) are nowhere near cold enough to destroy the tough, overgrown tissue that makes up a keloid. Medical cryotherapy, which uses liquid nitrogen at extreme subzero temperatures, is a different story entirely and is one of the more effective professional treatments available.
Why Home Ice Packs Fall Short
Keloids are dense masses of collagen produced by overactive scar-forming cells called fibroblasts. These cells don’t begin to die until tissue temperatures drop to roughly negative 30 to negative 40°C. A bag of ice or a gel pack from your freezer sits around 0°C at most, and the skin underneath it rarely drops below a few degrees above freezing. That’s enough to slow nerve signaling and briefly numb the area, which is why an ice pack can take the edge off itching or mild pain. But it does nothing to the underlying scar tissue.
If you do use ice for symptom relief, keep sessions to 10 to 20 minutes with a cloth barrier between the pack and your skin. Longer than 20 minutes can trigger reactive vasodilation, where blood vessels widen as the body tries to protect the tissue, potentially increasing swelling rather than reducing it. Space sessions at least one to two hours apart, and never fall asleep with an ice pack in place.
How Medical Cryotherapy Actually Works
Professional cryotherapy uses liquid nitrogen to freeze keloid tissue at temperatures far below what ice can achieve. The extreme cold forms ice crystals inside cells, cutting off their oxygen supply and causing the tissue to die. It also damages the blood vessels feeding the keloid, further starving it. Over the following weeks, the dead tissue breaks down and the scar flattens.
There are two main approaches. Contact or spray cryotherapy applies liquid nitrogen to the surface of the keloid, freezing it from the outside in. This works reasonably well for small keloids but tends to produce shallow, uneven freezing in larger ones. Intralesional cryotherapy inserts a needle-like probe directly into the scar and freezes it from the core outward, ensuring the entire mass reaches destructive temperatures. In comparative studies, intralesional cryotherapy achieved a mean volume reduction of 61%, compared with just 23% for the surface spray method.
Success Rates and What to Expect
The results from intralesional cryotherapy are among the more encouraging in keloid treatment. Recurrence rates in published studies range from 0 to 23%, which compares favorably to surgical removal alone, where keloids frequently grow back. In one study of 52 patients, every participant reported improvement in scar appearance, and 91% reported less pain, with an average pain reduction of nearly 4 points on a standard 10-point scale. All patients said they would recommend the treatment.
Most people need only one session, though keloids on the chest, which tend to be more stubborn, sometimes require a second round. The procedure itself causes moderate pain that typically becomes tolerable within an hour. Combining cryotherapy with steroid injections appears to produce even better results. One study comparing combination therapy to either treatment alone found the greatest improvements in scar thickness, pain, and itch when both were used together.
Skin Color Changes Are a Real Risk
The most significant side effect of cryotherapy is skin lightening at the treatment site. Melanocytes, the cells that produce skin pigment, are far more sensitive to cold than fibroblasts. They begin to die at temperatures of only negative 4 to negative 8°C, well before the scar tissue itself is affected. This means the skin over and around a treated keloid often loses color.
This risk is especially pronounced for people with darker skin tones, who are also the population most likely to develop keloids in the first place. In one comparative study, 91% of patients treated with surface cryotherapy developed significant depigmentation. Intralesional cryotherapy fared much better on this front: none of the 24 patients in the intralesional group developed marked lightening, because the freezing is concentrated inside the scar rather than on the skin surface. If you have darker skin, intralesional cryotherapy is generally the preferred approach for this reason.
Other Ways to Manage Keloid Symptoms
While ice offers only brief, superficial relief, several treatments target the itching and discomfort that drive many people to search for solutions in the first place. Prescription-strength corticosteroid creams can ease itchiness when applied regularly. Pulsed-dye laser sessions can flatten larger keloids over time while also reducing itch and fading the scar’s color. Some clinical evidence supports onion extract, applied topically or taken orally, for improving the appearance of keloid scars and reducing discomfort, though the evidence is less robust than for other options.
Keloid itching appears to involve nerve fiber changes within the scar itself. Testing has revealed that keloid tissue shows altered responses to temperature and touch, with signs of neuropathy that may explain why these scars itch so persistently. This is worth knowing because it means the itch isn’t just surface-level inflammation that cold can easily quiet. It’s a deeper nerve issue, which is why targeted medical treatments tend to provide more lasting relief than anything you can do with a freezer pack at home.