Dermatofibroma: symptoms, images, AI check 🟢 ICD-10: D23 | ICD-11: 2F23

Dermatofibroma is a benign skin lesion that appears as a firm nodule within the skin or slightly raised above its surface. It is formed from connective tissue (the skin’s structural layer) and is not related to pigment cells. These lesions are not contagious and cannot be transmitted from person to person.

Dermatofibromas most commonly appear in adults, especially after the age of 25–30. They are usually solitary and, in most cases, harmless, requiring no treatment.

What to Do if You Suspect a Dermatofibroma

If you notice a firm nodule on your skin, it is important to have it properly evaluated.

First step: consult a dermatologist. If needed, an oncologist may also be involved.

Pay attention to:

• The appearance of a new firm nodule
• Changes in size, shape, or color
• Itching or other sensations
• Frequent trauma (e.g., from clothing)

Important: Do not try to remove the lesion yourself. Timely medical consultation helps determine the exact nature of the nodule and rule out other skin conditions.

Appearance of Dermatofibroma

Dermatofibromas can vary in appearance but typically have the following features:

• Small nodule or slightly depressed lesion
• Round or oval shape
• Often symmetrical

Color may be:

• Skin-colored
• Grayish
• Brown or dark brown

Characteristic: lighter center with darker periphery

Surface:

• Usually smooth
• Sometimes slightly bumpy
• Skin lines in the center may be flattened

Size: usually small, up to 1 cm

Common locations:

• Legs
• Shoulder area
• Less commonly, other body parts

Characteristic sign: when the surrounding skin is pinched, the lesion “dimpling” inward forms a small depression.

Main Symptoms

In most cases, dermatofibromas do not cause significant symptoms.

Typically:

• No pain
• No discomfort
• Sometimes mild itching

The lesion usually feels firm or even hard.

Any new symptoms should prompt a medical consultation.

Causes

The exact cause of dermatofibroma is unknown, but several factors may contribute:

• Minor skin injuries
• Insect bites
• Individual skin characteristics
• Genetic predisposition

In simple terms, dermatofibroma may develop as the skin’s reaction to damage.

Disease Progression

Dermatofibroma develops from the skin’s connective tissue. After minor damage (e.g., a bite or microtrauma), localized growth of cells responsible for skin structure and strength can occur, resulting in a firm nodule. It grows slowly and usually remains stable.

Forms and Types

Dermatofibromas can differ in:

• Shape (raised or slightly depressed)
• Color
• Firmness

These differences generally do not affect safety.

When to See a Doctor

Seek a specialist if:

• The lesion grows quickly
• Color or shape changes
• Pain, itching, or bleeding occurs
• The nodule is frequently traumatized

Also, any suspicious skin lesion should be shown to a doctor.

Treatment

In most cases, treatment is not required.

If necessary (e.g., uncertain diagnosis or constant trauma), surgical removal with histopathological examination is performed.

Principles:

• Monitor the lesion
• Protect the skin from trauma
• Individualized approach

The treatment method is always determined by a doctor. Laser or other destructive methods are usually not recommended due to possible recurrence.

Q&A

Is dermatofibroma dangerous?

No, it is benign and usually not a health threat.

Does it need removal?

Not always. Removal is only indicated when necessary.

Why is it firm?

Because it consists of dense connective tissue.

Can it be confused with a mole?

Yes, they may look similar; a doctor’s assessment is recommended.

Can it disappear on its own?

Usually no, but it may remain stable for a long time.

Is it harmful to traumatize it?

Better to avoid trauma, as this may cause irritation.

How to distinguish dermatofibroma at home?

One sign is that the lesion “dimpling inward” when the surrounding skin is pinched.

How often should it be monitored?

Periodic self-checks are sufficient, with doctor consultation if changes occur.

Check Your Skin Instantly

Use the Mole Checker app: Skinive AI  to take a photo of a mole or lesion and get an AI-based risk assessment. It helps determine whether professional consultation is recommended, giving you fast guidance and peace of mind.

Sources

• World Health Organization (WHO)
• American Academy of Dermatology (AAD)
• National Cancer Institute (NCI)
• Fitzpatrick’s Dermatology
• DermNet NZ

Images of dermatofibroma: