Can a hypertrophic scar turn into a keloid?

Generally, they are considered distinct biological processes. While they share similarities in collagen overproduction, a hypertrophic scar is defined by its confinement to the wound site, whereas a keloid is defined by its expansion. They are typically categorized separately by dermatologists.

Do keloids always grow?

Not necessarily. While keloids are known for their potential to grow beyond the original wound, their growth can be slow or may eventually plateau. However, unlike hypertrophic scars, they do not typically regress on their own.

Which type of scar is harder to treat?

Keloids are generally more challenging to manage. Because they are characterized by an active, spreading growth pattern and a high rate of recurrence after removal, treatment often requires a combination of therapies rather than a single intervention.

Does the color of the scar indicate the type?

Color is not a definitive diagnostic tool. Both hypertrophic scars and keloids can appear red, pink, or hyperpigmented. The primary diagnostic distinction is the boundary of the scar and its growth behavior, not its hue.

Keloids vs Hypertrophic Scars: Key Differences

How can I tell if a scar is a keloid or hypertrophic?

The most immediate distinction lies in the boundaries of the scar relative to the original wound. Hypertrophic scars remain strictly within the margins of the initial injury, appearing as a raised, red line or patch that matches the shape of the cut or burn. They do not spread to healthy surrounding skin.

Keloids, by contrast, are characterized by their tendency to grow beyond the edges of the original wound. They behave like an overgrowth of fibrous tissue, expanding into adjacent healthy skin to create a bulbous, irregular mass. This expansion is a primary indicator for dermatologists when diagnosing the type of scarring.

While both types of scars present as raised, thickened tissue, their behavior over time differs. Hypertrophic scars often stabilize or even flatten slightly as they mature, whereas keloids frequently continue to grow and can become significantly larger than the inciting injury.

Feature	Hypertrophic Scar	Keloid
Growth Boundaries	Stays within wound margins	Spreads beyond wound margins
Growth Pattern	Often regresses over time	Can continue to grow indefinitely
Texture	Raised and firm	Thick, rubbery, or hard
Common Causes	Trauma, burns, surgery	Trauma, acne, piercings

What determines the physical appearance and texture?

Hypertrophic scars usually present as linear, raised ridges. They often appear pink or red due to increased vascularity during the healing process. Because they follow the line of the injury, they are often predictable in shape, appearing as a thickened version of the original laceration or surgical incision.

Keloids often take on a more globular or pedunculated shape. They may appear as smooth, shiny nodules that feel much denser than the surrounding skin. The color can range from flesh-colored to dark brown or purple, depending on the individual's skin tone and the age of the scar.

The texture of a keloid is often described as rubbery or cartilaginous. This is due to the disorganized, dense clusters of collagen fibers that form the mass. Hypertrophic scars, while firm, generally maintain a more consistent texture that aligns with the orientation of the original wound.

A close-up view of raised, thickened skin tissue showing texture variations.

Are there differences in how these scars develop?

The timing of scar appearance can offer clues. Hypertrophic scars typically develop shortly after an injury and reach their peak prominence within a few months. As the inflammatory response subsides, the scar may lose some of its redness and height, eventually settling into a stable state.

Keloids may take longer to become prominent. They can emerge months or even years after the initial skin trauma. Because the body's healing mechanism is effectively stuck in an 'overdrive' state, the production of collagen does not stop when the wound closes, leading to progressive enlargement.

Genetic predisposition plays a significant role in the development of keloids. While anyone can develop a hypertrophic scar following a deep cut or burn, certain individuals are biologically more prone to keloid formation. This is often observed in individuals with darker skin pigmentation, though it occurs across all ethnicities.

How do the sensations and symptoms differ?

Both types of scarring can cause physical discomfort, but the nature of the sensation often varies. Hypertrophic scars may feel tight or restrictive, particularly if they are located over a joint or an area of high skin tension. This tightness can occasionally limit the range of motion in the affected limb.

Keloids are frequently associated with more intense sensory symptoms. It is common for individuals with keloids to experience persistent itching (pruritus) or sharp, localized pain. These sensations occur because the dense mass of tissue can compress local nerve endings.

The psychological impact is also a factor in symptom reporting. Because keloids are often highly visible and can grow unpredictably, they may cause more significant distress regarding body image than a stable, linear hypertrophic scar. Discussing these specific sensations with a medical professional is important for determining a management plan.

A macro photograph of skin showing redness and irritation.

What factors influence the likelihood of abnormal scarring?

The depth and tension of a wound are critical factors. Shallow wounds are less likely to result in significant scarring. However, injuries that penetrate the dermis—the deeper layer of skin—carry a higher risk. High-tension areas, such as the chest, shoulders, and upper back, are particularly susceptible to both hypertrophic scars and keloids.

The type of injury also matters. Surgical incisions, deep lacerations, burns, and even inflammatory skin conditions like acne or chickenpox can trigger abnormal scarring. In the case of acne, the inflammation itself acts as the wounding agent that prompts the excessive collagen response.

Individual biological responses are the most unpredictable variable. Factors such as age, hormonal levels, and existing inflammatory conditions can influence how the skin repairs itself. While general trends exist, the specific way a person's body reacts to a wound is unique to their physiological makeup.