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What causes dermatofibromas?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
No one is sure what causes dermatofibromas. These tiny, firm reddish or brown bumps and spots can appear anywhere on the skin, though the legs seem to be the most commonly affected body part. Some doctors suspect that dermatofibromas may be a reaction to a minor injury, such as a bug bite or scratch. The good news is that dermatofibromas are harmless. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.