Dermatomyofibroma Explained: Symptoms, Causes, and Care

Written by Medicover Team and Medically Reviewed by Dr Girishma J , Dermatologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Dermatomyofibroma is a rare, benign skin tumor made up of fibroblasts and myofibroblasts, which are cells involved in the structure and repair of connective tissue. It usually develops within the dermis, the deeper layer of the skin, and tends to grow slowly. Dermatomyofibroma is not considered a skin cancer and generally has an excellent prognosis.

Dermatomyofibroma most often appears as a solitary, firm, plaque-like area or nodule on the skin. It is more commonly reported in young women and may also occur in children. The shoulder, upper arm, neck, trunk, and thigh are among the commonly affected areas. Because its appearance can resemble other skin tumors, a biopsy may be needed to confirm the diagnosis.

What Are the Types of Dermatomyofibroma?

Dermatomyofibroma is generally considered a single benign tumor entity rather than a condition with several established clinical types. However, lesions can vary in their appearance, size, and microscopic characteristics.

Plaque-like dermatomyofibroma: The typical lesion is an ill-defined, plaque-like proliferation within the dermis.
Nodular presentation: Some lesions appear clinically as a more distinct papule or nodule.
Superficial lesions: The tumor is primarily located within the dermis.
Lesions with subcutaneous extension: In some cases, tumor cells extend into the superficial or deeper portions of the underlying subcutaneous tissue.

These variations are usually determined through clinical and microscopic examination rather than by separate disease classifications.

What Are the Symptoms of Dermatomyofibroma?

Dermatomyofibroma often causes few or no symptoms. It typically appears as a slowly growing, firm plaque or nodule that may be skin-colored, reddish, or brown. The lesion may be more easily felt than seen, particularly when it is small or located on the upper trunk or shoulder.

Common features may include:

Skin-colored or discolored lesion: The affected area may appear normal in color or have a reddish-brown or slightly darker appearance.
Firm plaque or nodule: The lesion usually feels firm or fibroelastic when touched.
Slow growth: Dermatomyofibromas generally develop and enlarge gradually.
Usually painless: Most lesions do not cause pain or significant discomfort.
Occasional tenderness or irritation: Some lesions may become uncomfortable, particularly when exposed to repeated friction or pressure.
Single lesion: Dermatomyofibroma most commonly occurs as one lesion, although multiple lesions have occasionally been reported.

What Causes Dermatomyofibroma?

The exact cause of dermatomyofibroma is not known. It is considered a benign fibroblastic and myofibroblastic neoplasm, meaning it develops from connective-tissue cells within the skin. Current evidence does not establish a specific trigger such as trauma, infection, or environmental exposure.

Researchers have proposed that changes affecting fibroblasts and myofibroblasts may contribute to the development of these lesions. However, the precise biological mechanism remains unclear, and there are no established lifestyle-related causes that can be reliably prevented.

When Should You See a Doctor for Dermatomyofibroma?

Consult a dermatologist if you notice a new, persistent, or unusual skin lump or plaque, particularly if it continues to grow or changes in appearance.

A new firm lump or plaque that does not disappear
A lesion that gradually increases in size
Changes in the color, shape, or texture of an existing lesion
Persistent tenderness, pain, or irritation
A skin lesion that is difficult to distinguish from another type of tumor

Seek prompt medical evaluation if:

The lesion begins growing rapidly or changes significantly over a short period
The lesion develops persistent bleeding, ulceration, or marked inflammation
You develop a rapidly enlarging or unusually large skin mass

Most dermatomyofibromas are benign, but an appropriate medical examination and, when necessary, biopsy can help distinguish them from other skin tumors that may require different treatment.

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How Is Dermatomyofibroma Diagnosed?

Diagnosing dermatomyofibroma usually requires a combination of a skin examination and microscopic evaluation. Because its appearance can overlap with other benign and malignant spindle-cell tumors, clinical examination alone may not always establish the diagnosis.

Clinical examination: A dermatologist examines the lesion, including its size, shape, color, firmness, location, and growth pattern.
Dermoscopy: Dermoscopy may provide additional information about the surface and pigment pattern of a lesion, although dermatomyofibroma often requires tissue examination for confirmation.
Skin biopsy: A biopsy may be performed to obtain a tissue sample for microscopic examination.
Histopathological examination: Under the microscope, dermatomyofibroma typically shows a plaque-like proliferation of uniform spindle-shaped cells arranged in fascicles that are often parallel to the skin surface.
Immunohistochemistry: Special stains may be used when the diagnosis is uncertain. Findings can help distinguish dermatomyofibroma from other spindle-cell tumors.

Conditions that may need to be distinguished from dermatomyofibroma include dermatofibroma, leiomyoma, neurofibroma, perineurioma, dermatofibrosarcoma protuberans, and other spindle-cell lesions.

What Are the Treatment Options for Dermatomyofibroma?

Dermatomyofibroma is benign and generally does not require aggressive treatment. Management depends on the size and location of the lesion, symptoms, cosmetic concerns, and whether the diagnosis has been confirmed.

Surgical excision: Complete or conservative surgical removal may be performed when the lesion is symptomatic, cosmetically concerning, enlarging, or when tissue is needed to establish a definitive diagnosis.
Biopsy: An excisional or incisional biopsy may both diagnose the lesion and, in some cases, remove most or all of it.
Observation: Once a benign diagnosis has been established, observation and periodic clinical follow-up may be appropriate, particularly when removal could cause unnecessary scarring.
Follow-up: Follow-up may be recommended if there is uncertainty about complete removal or if the lesion changes over time.

There is no established role for chemotherapy or radiation therapy in the routine treatment of dermatomyofibroma. Published clinical series describe an excellent prognosis, with no documented recurrence or metastasis in the reported follow-up of typical lesions.

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What Are the Risk Factors for Dermatomyofibroma?

Because dermatomyofibroma is rare and its exact cause remains uncertain, specific risk factors have not been clearly established. It has been reported more frequently in certain age and sex groups and commonly affects particular areas of the body.

Age: Dermatomyofibroma is frequently reported in adolescents and young adults, although it can occur at other ages.
Sex: A female predominance has been observed in reported cases, although males can also develop the tumor.
Age in children: The condition can occur in children, including boys, so it should not be considered exclusively an adult condition.
Location: Lesions are commonly reported on the shoulder, upper arm, neck, trunk, and thigh.

What Are the Complications of Dermatomyofibroma?

Dermatomyofibroma usually does not cause serious complications because it is a benign tumor. The main concern is accurately distinguishing it from other skin lesions with a similar appearance.

Diagnostic uncertainty: Its clinical appearance may resemble other benign or malignant spindle-cell tumors, sometimes requiring biopsy and specialized testing.
Local discomfort: Although uncommon, a lesion may become irritated or tender depending on its location.
Cosmetic concerns: A visible lesion may cause concern because of its size, color, or location.
Surgical scarring: Removal can leave a scar, particularly when the lesion is located in a cosmetically sensitive area.

What Is the Prognosis of Dermatomyofibroma?

The prognosis of dermatomyofibroma is generally excellent. It is a benign tumor with slow growth and little or no symptoms in most patients. Published case series have not demonstrated malignant behavior, and recurrence has not been observed even in some cases where excision was incomplete or marginal.

Once the diagnosis is confirmed, most patients can be reassured about the benign nature of the condition. Continued medical review may be appropriate if the lesion changes or if there is uncertainty about the diagnosis.