Scarring is a natural part of the healing process, but not all scars behave the same way. Two of the most commonly confused types are keloid scars and hypertrophic scars. While they may look similar at first glance, their causes, growth patterns, and treatments differ significantly.
Understanding the difference is crucial—not just for appearance, but for choosing the right treatment strategy.
Quick Answer: What’s the Difference Between Keloid and Hypertrophic Scars?
- Keloid scars grow beyond the original wound boundary and may continue expanding over time.
- Hypertrophic scars stay within the wound area and often improve naturally over time.
What Is a Keloid Scar?
A keloid scar is an overgrowth of dense fibrous tissue that develops after skin injury. Unlike normal scars, keloids extend beyond the original wound and do not regress on their own.
Key Characteristics of Keloid Scars:
- Grow beyond the original wound
- Often raised, thick, and shiny
- May be pink, red, or dark brown
- Can cause itching, pain, or discomfort
- Continue growing over time
Common Causes:
- Acne scars
- Surgical wounds
- Piercings (especially ears)
- Burns or cuts
High-Risk Areas:
- Chest
- Shoulders
- Earlobes
- Jawline
What Is a Hypertrophic Scar?
A hypertrophic scar is also raised but remains confined to the original injury site. It forms due to excess collagen production during healing but behaves more predictably than keloids.
Key Characteristics of Hypertrophic Scars:
- Stay within the original wound boundary
- Raised and sometimes red or pink
- May feel firm or thick
- Often flatten and fade over time
Common Causes:
- Surgical incisions
- Burns
- Traumatic injuries
Keloid vs Hypertrophic Scars: Side-by-Side Comparison
| Feature | Keloid Scar | Hypertrophic Scar |
|---|---|---|
| Growth | Extends beyond wound | Stays within wound |
| Progression | Continues growing | Improves over time |
| Appearance | Thick, rounded, shiny | Raised but more linear |
| Symptoms | Itchy, painful | Mild discomfort |
| Recurrence | High | Low |
| Treatment complexity | More difficult | Easier |
Why Does the Difference Matter?
1. Treatment Approach Is Different
- Keloids often require advanced treatments such as:
- Steroid injections
- Laser therapy
- Cryotherapy
- Surgical removal (with caution)
- Hypertrophic scars may respond well to:
- Silicone gel or sheets
- Pressure therapy
- Basic topical treatments
2. Risk of Recurrence
Keloids have a high recurrence rate, especially if removed incorrectly. Hypertrophic scars rarely come back once treated.
3. Long-Term Skin Health
Misidentifying the scar type can lead to:
- Ineffective treatments
- Worsening of the scar
- Unnecessary costs
What Causes These Scars to Form?
Both types result from excess collagen production, but the body’s healing response differs.
Factors That Increase Risk:
- Genetics (especially for keloids)
- Skin type (more common in darker skin tones)
- Age (younger individuals are more prone)
- Location of the wound
- Tension on the healing skin
Can You Prevent Keloid or Hypertrophic Scars?
While not always preventable, you can reduce the risk:
Prevention Tips:
- Keep wounds clean and properly dressed
- Avoid unnecessary skin trauma (e.g., piercings if prone to keloids)
- Use silicone gel sheets early
- Minimize tension on healing skin
- Seek early treatment for abnormal scar growth
When Should You See a Specialist?
You should consult a professional if:
- The scar is growing rapidly
- It extends beyond the original wound
- You experience pain, itching, or tightness
- The scar affects your confidence or mobility
Early diagnosis helps determine whether it’s a keloid or hypertrophic scar, which directly impacts treatment success.
Best Treatment Options for Each Type
Keloid Scar Treatments:
- Corticosteroid injections
- Laser therapy (e.g., pulsed dye laser)
- Cryotherapy
- Surgical excision (combined with other therapies)
- Radiation therapy (in severe cases)
Hypertrophic Scar Treatments:
- Silicone gel/sheets
- Pressure therapy
- Laser treatment
- Steroid creams or injections (mild cases)
How can I tell if my scar is keloid or hypertrophic?
If the scar grows beyond the original wound and keeps expanding, it is likely a keloid. If it stays within the wound and improves over time, it is likely hypertrophic.
Do keloid scars go away on their own?
No. Keloids typically do not regress without treatment and may continue to grow.
Are hypertrophic scars permanent?
Not always. Many hypertrophic scars flatten and fade over time, especially with proper treatment.
Which scar type is harder to treat?
Keloid scars are more difficult to treat due to their tendency to recur and grow aggressively.
No. Keloids are benign (non-cancerous), but they can cause discomfort and cosmetic concerns.
Is laser treatment effective for both types?
Yes, but results vary. Laser therapy is generally more predictable for hypertrophic scars than for keloids.
Keloids result from an overactive healing response, where collagen production continues beyond what is needed.
Final Thoughts
Although keloid and hypertrophic scars may appear similar, their behavior and treatment paths are fundamentally different. Correct identification is the first step toward effective management.
If you’re unsure about your scar type, seeking professional evaluation can save time, cost, and prevent unnecessary complications.
