Dermatofibroma

A dermatofibroma refers to a benign fibrous nodule which usually affects the skin of lower legs. It occurs in people of all ages; however, the prevalence is higher in women than in men.

It has not been established yet if dermatofibroma is neoplasm or simply a reactive process. These lesions are made up of proliferating fibroblasts. Histocytes can also play a role.

Dermatofibroma usually develops in the areas of legs and arms, but can also affect trunk and other body sites.

The clinical features of dermatofibroma are quite distinct. Affected individuals have from 1 to 15 lesions. The size of a lesion can vary from 0.5 to 1.5 cm, but majority of lesions are 7 to 10 mm in diameter.  They appear as immovable firm nodules on the surface of the skin and as mobile nodules in the subcutaneous tissue. The colour may appear as pink or light brown on fair skin and as dark brown or black on darker skin. The lesions are usually symptomless, but some patients report experiencing pain and itch.

Since dermatofibroma can appear as raised lesion and it can be easily traumatized on daily basis and during everyday activities (e.g. by a razor).

Quite often, dozens can erupt within couple months due to immunosuppression, such as medications, cancer, or autoimmune disease.

Dermatofibroma does not progress into cancer. However, in some cases, it can be mistaken for desmoplastic melanoma.

Dermatofibroma is easy to diagnose due to its distinct features. The examination is usually done via dermatoscopy. The most commonly observed dermatoscopic pattern is central white area which is surrounded by a lightly pigmented network. The skin biopsy or diagnostic excision can be done if atypical features like ulceration, enlargement, or asymmetrical structures are observed during examination.

A dermatofibroma is a harmless skin lesion and is usually asymptomatic. The lesion can be removed surgically if it causes discomfort or concern.

Cryotherapy, laser, and shave biopsy can be incorporated into treatment to reduce dermatofibroma.

Centre for Medical and Surgical Dermatology offers unique and personalized dermatofibroma treatment options for each patient.