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Dermatofibroma
What is a dermatofibroma?
A dermatofibroma, as the name
suggests, is an area of dermal fibrosis, frequently associated with epidermal
thickening and hyperpigmentation, giving rise to its appearance as a light tan
to dark brown papule. They are typically small (~5 mm in diamter),
slightly elevated, and indurated (hard). They may be found anywhere on the
body, but favor the lower extremities. Related histological entities are
histiocytoma and sclerosing
hemangioma.
With what can
a dermatofibroma
be confused?
A
nevus is
also brown but is not exhibit the "dimple sign" upon pinching and are usually
softer than dermatofibromas. A dark dermatofibroma may resemble
malignant melanoma.
Dermatofibrosarcoma
protuberans is the malignant counterpart of dermatofibroma. It is a
slowly enlarging fibrous tumor with low metastatic potential. It is
typically larger than a dermatofibroma (>5 mm), irregular in shape, and
continuously enlarging.
How is a
dermatofibroma
diagnosed?
Dermatofibromas are diagnosed
clinically, often noted as an incidental finding during skin examination. They
are usually asymptomatic, but the appearance of a new nodule may cause patients
to seek reassurance concerning the possibility of malignancy. A diagnostic
clue is its firm consistency accompanied by the "dimple sign"—central dimpling
caused by pinching. If there is any doubt, a biopsy is warranted.
How is a
dermatofibroma treated?
If desired, simple excision is
sufficient treatment. However, these lesions do not have to be removed.
What is the prognosis for dermatofibroma?
Dermatofibromas are stable in size
and do not spontaneously involute. They are not malignant and have no
complications.
Date created: 04/02/07
Last updated:
01/03/2009
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