Keloids are solid masses of dense collagen fiber, not fluid-filled bumps, so they don’t pop the way a pimple or cyst does. If something that looks like a keloid is draining fluid or pus, what’s actually happening is either an infected keloid, a cyst that formed inside the scar tissue, or a different type of growth altogether. Any of these situations can lead to pain, worsening inflammation, and a larger scar if not handled properly.
Why Keloids Don’t Actually Pop
A keloid is a thick, raised scar made of tightly packed collagen (the protein that gives skin its structure). Unlike a blister or cyst, there’s no pocket of fluid inside. Keloids form when your body’s wound-healing process goes into overdrive, depositing excessive amounts of collagen well beyond the borders of the original injury. The result is a firm, rubbery mass of fibrous tissue.
So if you squeeze a keloid, you won’t get the satisfying release you’d get from a pimple. You’ll just irritate it. And that irritation matters, because any trauma to a keloid can trigger a new round of inflammation and collagen production, potentially making the scar bigger than it was before.
What’s Really Happening When a Keloid Drains
When people describe a keloid “popping,” one of two things is usually going on.
The first is an embedded cyst. Research on infected keloids found that about 20% of cases involved epidermoid cysts trapped within the scar tissue. These cysts form when skin cells get enclosed inside the keloid as it grows. Over time, the cyst fills with a thick, cheesy, foul-smelling material. If the cyst ruptures, either on its own or from pressure, that material drains out and triggers an intense inflammatory reaction in the surrounding tissue. This looks and feels like the keloid itself burst open.
The second possibility is a keloid infection, sometimes called suppurative keloidosis. Bacteria can enter through tiny cracks in the skin overlying the keloid, especially in areas that experience friction or sweating. The infection produces redness, severe pain, tenderness, and pus discharge. In clinical studies, infected keloids frequently showed abscess formation and ulceration. The cycle follows a predictable pattern: fibrous tissue traps bacteria or debris, a pocket of infection forms, the pocket ruptures and drains, and then a foreign-body inflammatory response kicks in, making everything worse.
Why Popping or Squeezing Makes Things Worse
Keloids are driven by inflammation. The more inflammation in the area, the more collagen your body deposits, and the larger the scar grows. This relationship is well established: the intensity of inflammation is directly correlated with final scar size.
When a keloid is injured, whether by squeezing, cutting, or an infection rupturing through the surface, damaged cells release molecular alarm signals. These signals activate immune cells in the surrounding tissue, including mast cells that stimulate the collagen-producing cells (fibroblasts) to multiply and ramp up production. The result is a vicious cycle: trauma causes inflammation, inflammation drives more collagen, and more collagen means a bigger keloid.
This is the same reason surgical removal of keloids has such high failure rates. Even when a keloid is professionally excised, recurrence rates range from 50% to 80% without additional treatment. Trauma or injury at the site is the single most common trigger for recurrence, accounting for roughly 64% of cases in one study. Squeezing or picking at a keloid at home carries the same risk on a smaller scale.
Signs of Infection to Watch For
If your keloid has opened up or is draining, the key concern is whether infection is present. Look for:
- Increasing pain, swelling, or warmth around the keloid
- Redness spreading outward from the opening, especially red streaks
- Pus or foul-smelling discharge
- Fever
Any of these signs warrant prompt medical attention. Keloid infections can spread into surrounding tissue and are difficult to manage once established, partly because the dense scar tissue has limited blood flow, making it harder for your immune system to reach the infection.
Immediate Care for an Open Keloid
If your keloid has broken open, whether from an infection, a ruptured cyst, or accidental injury, keep the area clean and protected while you arrange to see a doctor. Apply a thin layer of petroleum jelly to the wound and cover it with a nonstick bandage. Don’t squeeze out remaining fluid or try to clean inside the opening with anything sharp. The goal is to minimize further trauma and keep bacteria out.
Once the wound begins closing, covering the area with a silicone gel bandage (cut slightly larger than the wound) can help regulate how the scar heals. Silicone sheeting is one of the most widely recommended noninvasive tools for managing keloid scars, and applying gentle pressure over the silicone with a wrap or bandage adds additional benefit.
It Might Not Be a Keloid
If the bump drained easily and produced thick, whitish, foul-smelling material, there’s a real possibility it was never a keloid in the first place. Epidermoid cysts can form in scar tissue and look very similar to keloids from the outside. The key difference is that cysts often have a small pore or punctum visible on the surface, which a dermatologist can identify with a close examination or a dermatoscope. Cysts are treated differently from keloids, so getting the right diagnosis matters.
How Keloids Are Treated
If a keloid has ruptured, become infected, or grown larger after being disturbed, treatment typically involves a combination of approaches rather than a single fix. Current guidelines recommend steroid injections directly into the keloid as the first-line treatment. These injections reduce inflammation and slow collagen production, often flattening the scar over a series of sessions.
For keloids that don’t respond to steroid injections, options include cryotherapy (freezing the tissue), radiation therapy after surgical removal, or injections of chemotherapy agents that slow cell growth within the scar. Surgical excision alone is generally a last resort because of those high recurrence rates. When surgery is performed, it’s almost always combined with radiation or steroid injections to prevent the keloid from growing back even larger.
The broader trend in keloid management is toward individualized, multimodal treatment. Your doctor will consider the keloid’s size, location, how long you’ve had it, and how it’s responded to past treatments. There is no single cure that works for every keloid, but combining therapies significantly improves outcomes compared to any single approach.