Diagnosing hypertrophic scars is primarily a clinical process based on the scar’s appearance and location. Understanding when to seek evaluation and which tests may be necessary helps ensure proper management of these raised, thickened scars that develop after skin injury.

Introduction: Who Should Seek Diagnostic Evaluation

If you notice a scar that appears thicker, raised, or redder than you would expect after a skin injury, it may be worth consulting a healthcare provider. Hypertrophic scars typically develop within one to two months after an injury, appearing as raised, firm tissue that stays within the boundaries of the original wound.^[1] People who have experienced burns, surgical incisions, or trauma to areas where the skin is stretched tight—such as the chest, back, shoulders, or joints—are more likely to develop these scars and should monitor their healing carefully.

You should consider seeking medical evaluation if your scar becomes increasingly uncomfortable, painful, or itchy, or if it limits your movement, especially around joints. Additionally, if the scar seems to be growing beyond the original wound area or continues to thicken months after the injury, this warrants professional assessment. Early consultation can make a significant difference, as some preventive measures are most effective when started soon after injury.^[1]

Individuals with certain risk factors should be particularly vigilant. Those with darker skin complexions, people between the ages of 10 and 30, and anyone with a history of abnormal scarring should pay close attention to how their wounds heal.^[3] If you’ve previously developed hypertrophic scars or have family members who tend to scar excessively, it’s advisable to inform your doctor before any planned surgery or procedure so that preventive strategies can be discussed.

Classic Diagnostic Methods

The diagnosis of hypertrophic scars is primarily clinical, meaning it relies heavily on visual examination and the patient’s history rather than complex laboratory tests. When you visit a healthcare provider with concerns about scarring, they will first conduct a thorough physical examination of the affected area. The doctor will observe the scar’s appearance, noting its color (typically pink to red), texture (raised and firm), and boundaries (whether it stays within the original wound or extends beyond it).^[1]

During the examination, your healthcare provider will ask detailed questions about the injury that caused the scar. They’ll want to know when the injury occurred, how deep it was, whether there was any infection or inflammation during healing, and whether you experienced delayed wound closure. These details help distinguish hypertrophic scars from other types of scarring. The provider will also inquire about symptoms such as itching, pain, or functional limitations, as these are common with hypertrophic scars.^[2]

One of the most important aspects of diagnosis is differentiating hypertrophic scars from keloid scars. While both appear as raised, thick scars, they have distinct characteristics. Hypertrophic scars develop relatively quickly—usually within one to two months after injury—and stay confined to the original wound site. They are typically pink to red in color. Keloids, on the other hand, may take three months to years to develop, spread beyond the wound borders, and appear red to purple. The distinction matters because the two conditions respond differently to treatment and have different prognoses.^[1]

Your healthcare provider will also assess the location of the scar. Hypertrophic scars are more common in areas where the skin experiences tension, such as over the shoulders, upper arms, back, chest, and joints like elbows and knees. Understanding where the scar is located helps confirm the diagnosis and guide treatment planning.^[1]

In most cases, laboratory tests or imaging studies are not necessary for diagnosing hypertrophic scars. The diagnosis is made based on the appearance of the scar, its location, and its behavior over time. However, in certain situations where there is diagnostic uncertainty or concern about other conditions, your doctor might consider additional evaluation.^[5]

When there is doubt about the diagnosis, or if the scar shows unusual features that raise concern for other skin conditions, a skin biopsy may be performed. During this procedure, a small sample of scar tissue is removed and examined under a microscope. The microscopic examination can reveal the characteristic features of hypertrophic scars, such as collagen fibers arranged in a wavy, regular pattern parallel to the skin’s surface. This differs from keloids, which show a disorganized collagen pattern with more blood vessels present.^[3]

A biopsy is rarely the first step in diagnosis, but it can be helpful when the healthcare provider needs to rule out other skin conditions or when the scar’s appearance is atypical. The procedure is generally quick and performed in an office setting, though it does create another small wound that will itself heal with a scar.^[3]

Your doctor will also assess the functional impact of the scar. If the hypertrophic scar is located near or across a joint, they will evaluate whether it restricts your movement. Scars that limit mobility or cause significant discomfort may require more aggressive treatment approaches. The evaluation includes observing how you move the affected area and asking about any difficulties you experience in daily activities.^[5]

Diagnostics for Clinical Trial Qualification

While clinical trials for hypertrophic scar treatments exist, the specific diagnostic criteria used to qualify patients for these studies follow similar principles to standard clinical diagnosis. Researchers conducting clinical trials need to ensure that participants truly have hypertrophic scars rather than keloids or other scar types, as this affects how well treatments work and how results are interpreted.

In research settings, investigators typically use standardized assessment scales to evaluate scars before enrolling participants. These scales measure various characteristics of the scar, including its height (how much it’s raised above the surrounding skin), color intensity, pliability (how soft or hard it feels), and surface characteristics. Some trials may use specific measurement tools to document the scar’s dimensions precisely, creating a baseline against which treatment effects can be measured.^[12]

Clinical trials may also require documentation of the scar’s history, including when and how the injury occurred, previous treatments attempted, and the scar’s progression over time. This information helps researchers select participants who are most likely to benefit from the treatment being studied and ensures that study groups are comparable.

Photographic documentation is commonly used in clinical trial settings to track changes in scar appearance over time. Standardized photographs taken under consistent lighting conditions allow researchers to objectively assess whether a treatment is working. These images are often evaluated by multiple reviewers to ensure accuracy and consistency in assessment.^[12]

Some clinical trials may include additional assessments beyond basic visual examination. Patient-reported outcome measures are increasingly used to capture how the scar affects quality of life, including symptoms like itching and pain, as well as psychological impacts such as self-consciousness or anxiety about the scar’s appearance. These subjective measures complement objective physical assessments to provide a complete picture of the scar’s impact.^[12]

Clinical trials investigating new treatments for hypertrophic scars must carefully exclude patients with keloids, as these two conditions respond differently to treatment. Researchers use the same distinguishing features described earlier—such as whether the scar extends beyond the original wound and the timing of its development—to ensure proper patient selection. Accurate diagnosis at the enrollment stage is essential for generating reliable research results that can guide future treatment approaches.^[3]