Keloids hurt because they trap your skin in a cycle of chronic inflammation, nerve irritation, and mechanical stress that can persist long after the original wound has healed. About 46% of people with keloids report pain, and the sensation is often described as tenderness or a burning feeling just beneath the skin surface, especially while the scar is actively growing. Understanding why this happens starts with what’s going on inside the scar tissue itself.
Inflammation That Doesn’t Shut Off
Normal wound healing involves a burst of inflammation that gradually resolves. In keloids, that inflammatory process keeps running. Keloid tissue contains unusually high concentrations of inflammatory cells, including mast cells, macrophages, and lymphocytes. These cells release signaling molecules, particularly two called IL-4 and IL-13, that serve a dual role: they drive the excessive collagen production that makes the scar grow, and they directly stimulate nerve fibers in the skin.
This is the core reason keloids are painful. The same chemicals responsible for building up the thick, raised scar tissue are also activating pain and itch receptors. IL-4 and IL-13 bind to receptors on nearby nerve fibers, and these receptors are significantly more abundant in keloidal skin than in normal skin. The result is a scar that essentially broadcasts pain and itch signals to your brain as a byproduct of its own growth. Another signaling molecule involved in wound healing, IL-31, has been directly linked to itch intensity in skin wound tissue, which helps explain why 86% of keloid patients report itching alongside or instead of pain.
How Nerve Fibers Get Trapped in the Cycle
Keloids don’t just irritate nerves passively. They can change how the nerves themselves function. Studies of keloid patients have found that 43% experience mechanical allodynia, a condition where light touch that wouldn’t normally hurt becomes painful. This suggests the sensory nerve fibers in and around the keloid have become hypersensitive.
The mechanism involves a feedback loop. When skin is stretched or stressed, sensory fibers release neuropeptides, small proteins that trigger inflammation in the surrounding tissue. These neuropeptides cause blood vessels to dilate, mast cells to release histamine, and more inflammatory signals to accumulate. In keloids, a growth factor called NGF (nerve growth factor) becomes overproduced, which can cause nerve fibers to release these inflammatory neuropeptides continuously, even without any physical trigger. Once this cycle starts, the scar essentially generates its own pain signals from the inside out.
Why Location Matters
Keloids are most common on the anterior chest, shoulders, upper back, and lower abdomen. These aren’t random locations. They’re areas of the body that experience constant, cyclical stretching from everyday movements like breathing, reaching, and bending. That mechanical stress is a direct contributor to keloid pain.
Skin stretching activates specialized pain receptors called mechanosensitive nociceptors on sensory fibers. In healthy skin, these receptors help you feel pressure and detect potential injury. In keloid tissue, they’re already primed by the inflammatory environment, so even normal body movement can trigger or worsen pain. This is why keloids on the chest or shoulders tend to be more symptomatic than those in areas with less movement. The scar is being mechanically aggravated dozens of times a minute just from breathing.
What Keloid Pain Feels Like
Keloid pain doesn’t feel like a typical wound. People most commonly describe it as tenderness or a burning sensation under the skin near the scar. It’s often worse during active growth periods, when the scar is expanding beyond the borders of the original injury. Some people feel discomfort only when the keloid is touched or pressed, while others experience spontaneous pain without any contact.
The itching that accompanies keloid pain is not a separate issue. It shares the same inflammatory pathway. IL-4 and IL-13 directly stimulate itch-sensing nerve fibers, and the histamine released by mast cells in the scar adds another layer of irritation. For many people, the itch is actually more disruptive than the pain itself, affecting sleep and daily comfort. Scratching, of course, creates more mechanical stress on the scar, which can feed back into the pain cycle.
What Makes Keloid Pain Worse
Growing keloids are the most symptomatic. As the scar expands, it recruits more inflammatory cells, produces more collagen, and stretches the surrounding healthy skin, all of which amplify pain and itch signals. Clothing that rubs against the keloid creates friction that activates those already-sensitized nerve fibers. Tight or rough fabrics over a chest or shoulder keloid can turn low-level discomfort into noticeable pain throughout the day.
Physical activity that stretches the skin near the scar, particularly upper body movements for chest and shoulder keloids, tends to flare symptoms. Sweat can also irritate the scar surface, though this is more commonly linked to itching than deep pain.
How Treatments Address Keloid Pain
Because keloid pain is driven by inflammation, treatments that reduce the inflammatory load in the scar also tend to relieve symptoms. Steroid injections directly into the keloid are the most common first-line approach. Even low-potency topical steroids have been shown to reduce expression of the key inflammatory molecules, including IL-13, that drive both scar growth and nerve irritation.
A clinical trial comparing steroid injections alone versus steroid injections combined with cryotherapy (freezing) found that the combination approach was effective in about 82% of patients, compared to 61% with injections alone. Patient-reported symptom scores, which include pain, itching, and stiffness, dropped substantially with both approaches but improved faster and more dramatically with the combination treatment. By 12 weeks, patients receiving combined therapy rated their symptoms at roughly one-third of their baseline levels.
Newer treatments target the inflammatory pathway more precisely. Dupilumab, a medication that blocks IL-4 and IL-13 signaling, has shown promise in keloid patients specifically because it interrupts the molecules responsible for both scar growth and nerve stimulation. By targeting the root cause rather than just suppressing general inflammation, this approach addresses pain and itch at the source.
Surgical removal alone has a high failure rate for keloids, with about 51% recurring after excision without follow-up treatment. When a keloid regrows, it typically brings back the same pain and itch symptoms. This is why surgery is almost always paired with steroid injections, radiation, or other therapies to prevent the inflammatory cycle from restarting.
Why Some Keloids Hurt More Than Others
Not all keloids are equally painful. The factors that influence symptom severity include location (high-tension areas hurt more), size (larger keloids have more inflammatory tissue), and growth phase (actively expanding keloids are more symptomatic than stable ones). Individual differences in nerve density and inflammatory response also play a role, which is why two people with similar-looking keloids can have very different pain experiences.
Keloids that have been present for years without growing may cause little to no pain, while a new or recently irritated keloid on the chest can be a constant source of burning and tenderness. If a previously quiet keloid starts hurting again, it often signals a new phase of growth or increased inflammation within the scar.