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Dermatofibroma: Causes, Symptoms & Treatment

A dermatofibroma is a benign skin nodule that most commonly appears on the legs. It is harmless and usually requires no treatment.

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Things worth knowing about "Dermatofibroma"

A dermatofibroma is a benign skin nodule that most commonly appears on the legs. It is harmless and usually requires no treatment.

What is a Dermatofibroma?

A dermatofibroma is a benign (non-cancerous) thickening of the skin that presents as a firm, small nodule. It develops within the connective tissue of the skin and is one of the most common benign skin tumors. Dermatofibromas are generally harmless and grow very slowly, if at all. They can occur in adults of all age groups but are most frequently seen in women of middle age.

Causes

The exact cause of dermatofibromas is not fully understood. The following triggering factors are discussed:

Minor skin injuries, such as insect bites, shaving cuts, or splinters
Reactive proliferation of connective tissue in response to local irritation or inflammation
Genetic predisposition that may increase susceptibility
Altered immune function, with higher occurrence reported in immunosuppressed individuals

In many cases, no clear trigger can be identified.

Symptoms

Dermatofibromas have characteristic features that often allow clinical recognition:

Small, firm nodule under the skin surface (diameter typically 0.5 to 1.5 cm)
Color ranging from reddish-brown to dark brown, rarely skin-toned
Most commonly located on the lower legs or upper arms
Lateral compression causes the overlying skin to dimple inward -- known as the dimple sign (or Fitzpatrick sign)
Usually painless, occasionally mildly tender or itchy
Very slow or no growth over months to years

Diagnosis

Diagnosis is typically made through a clinical examination by a dermatologist. The following diagnostic methods may be used:

Inspection and palpation: The physician visually assesses and palpates the nodule and checks for the characteristic dimple sign.
Dermatoscopy: A magnified view of the skin using a dermatoscope can reveal characteristic patterns associated with dermatofibroma.
Histological examination: If there is diagnostic uncertainty or a malignant lesion needs to be ruled out, a tissue sample (biopsy) may be taken and examined under a microscope. Typical findings include increased fibroblasts and collagen fibers within the dermis.

It is important to differentiate a dermatofibroma from potentially malignant lesions with a similar appearance, such as dermatofibrosarcoma protuberans.

Treatment

Since a dermatofibroma is benign, no treatment is necessary in most cases. Intervention may be considered in the following situations:

Cosmetic concerns: When the patient finds the nodule aesthetically bothersome
Mechanical discomfort: Such as pressure pain or irritation from clothing
Diagnostic uncertainty: When a malignant lesion cannot be confidently excluded

The main treatment options include:

Surgical excision: Complete surgical removal of the nodule with a safety margin of healthy tissue. This is the most reliable method but leaves a scar.
Shave excision: Superficial shaving of the nodule; carries a higher risk of recurrence than complete excision.
Cryotherapy: Treatment with liquid nitrogen (freezing) can reduce the size of the nodule but rarely eliminates it completely.
Laser treatment: May be used as a cosmetic option in selected cases.

After complete surgical removal, the risk of recurrence is low. Regular self-examination of the skin and medical follow-up in case of any changes to the nodule are recommended.

References

Rapini, R. P.: Practical Dermatopathology. Elsevier Saunders, 3rd edition, 2021.
Bolognia, J. L., Schaffer, J. V., Cerroni, L.: Dermatology. Elsevier, 4th edition, 2018.
American Academy of Dermatology (AAD): Information on benign skin growths and dermatofibroma. Available at: www.aad.org

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