Dermatofibroma
En Español (Spanish Version)

Definition
A dermatofibroma is an very common skin growth. It is a small, firm bump on the skin. The dermis layer of skin contains nerve endings, glands, and vessels. The bump is an overgrowth of the tissue in the dermis layer. The bump is generally pinkish-brown in color. It is often found on the legs. Sometimes more than one appears. Generally, they are harmless and are not connected to skin cancer.

Layers of the Skin

In dermatofibroma, the overgrowth occurs in dermis layer of the skin.
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Causes
The cause is unknown. Dermatofibromas sometimes appear after a minor injury to the skin. This can include an insect bite or a prick of a thorn.

Risk Factors
The following factors increase your chance of developing dermatofibromas:
  • Sex: women are more likely to develop this condition than men.
  • Age: adults (dermatofibromas are rarely found in children)

Symptoms
These bumps rarely cause symptoms. However, it is always important to see a doctor about any new skin growth.

Dermatofibromas are:
  • Usually reddish-brown in color
    • Are darker in individuals with darker skin
    • May change color over time
  • Found most often on the legs, but may also appear on the arms or torso of the body
  • Small in size (3-10 millimeters)
  • Very firm to touch
  • Sometimes itchy or sensitive when touched
  • Raised from the skin and may bleed if damaged (eg, a dermatofibroma can bleed if you shave over it)

Diagnosis
Your doctor will ask about your symptoms and medical history. A physical exam will be done.

A dermatofibroma is diagnosed by sight and touch. Your doctor may also squeeze the skin over the bump. When squeezed together, a dimple will form.

If diagnosis is not certain, the bump can be surgically removed. The removed tissue will be examined under a microscope.

Treatment
Dermatofibromas do not go away by themselves. Treatment is usually not necessary. It may be done if they are causing you some discomfort (itching or pain) or you feel they are unattractive. They do not pose any risk to your health.

Talk with your doctor about the best plan for you. Treatment options include the following:

Removal
The dermatofibroma may be cut off surgically. This can be done with local anesthesia.

Keep in mind that the dermatofibroma is usually deep. The removal will leave a scar.

Freezing
Liquid nitrogen can be used to freeze the bump and flatten it out. This method usually leaves a white mark behind. The dermatofibroma may also eventually grow back.

Prevention
There is no way to prevent dermatofibromas.




RESOURCES:
American Academy of Dermatology

British Association of Dermatologists

CANADIAN RESOURCES:
Canadian Dermatology Association


References:
Dermatofibroma. British Association of Dermatologists website. Available at: http://www.bad.org.uk/site/809/default.aspx . Accessed November 16, 2012.

Dermatofibroma. New Zealand Dermatological Society website. Available at: http://dermnetnz.org/lesions/dermatofibroma.html . Accessed November 16, 2012.

Prieto VG, Reed JA, Shea CR. Immunohistochemistry of dermatofibromas and benign fibrous histiocytomas. J Cutan Pathol . 1995;22(4):336-341.

Last Reviewed November 2012



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