Benign Growths & Cysts
Dermatofibroma
WHAT IS IT
A benign (non-cancerous) skin nodule
HOW COMMON
Common, especially on the legs
CONTAGIOUS?
No — you cannot catch it or spread it
CURABLE?
Harmless; removal is optional
What Is It?
A dermatofibroma is a small, firm, harmless bump under the skin, most often on the lower legs. It feels like a hard little button and may be pink, brown, or slightly darker than nearby skin. They are benign and usually stay small for years.
Signs & Symptoms
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Small, firm bump that feels like a hard button
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Pink, red, brown, or slightly darker than the skin
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Often "dimples" downward when pinched (dimple sign)
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Usually painless, but can itch or feel tender
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Most common on the lower legs, arms, or trunk
Why Does It Happen?
The exact cause is unknown, but dermatofibromas often appear after a minor skin injury such as an insect bite, ingrown hair, or small scratch. The skin responds by forming a firm cluster of scar-like cells. They are more common in adults and in women.
Treatment Options
Dermatofibromas are harmless and usually need no treatment. Removal is optional and is considered when a bump is bothersome, painful, or changing.
LEAVE IT ALONE
The usual choice — no treatment is needed for a stable, harmless bump.
SURGICAL REMOVAL
A minor excision can remove it, but leaves a small scar.
CRYOTHERAPY / SHAVE
May flatten the surface, though the deeper part often remains.
MONITOR CHANGES
Watch for rapid growth or new symptoms, which should be checked.
Tips for Managing It at Home
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Avoid shaving directly over the bump to prevent irritation
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Note any change in size, color, or firmness
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Weigh that removal trades the bump for a small scar
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Don't attempt to cut or remove it yourself
When to Call Your Provider
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The bump grows quickly or changes color
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It becomes painful, bleeds, or develops a sore
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You're unsure whether it's a dermatofibroma or something else
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It interferes with shaving or clothing and you'd like it removed
Sources & further reading
The information in this handout is based on general dermatology guidance from the reputable organizations below. These links are provided for patients who wish to read more from trusted sources.
DermNet. Dermatofibroma. https://dermnetnz.org/topics/dermatofibroma
MSD/Merck Manual. Dermatofibroma. https://www.msdmanuals.com/professional/dermatologic-disorders/benign-skin-tumors-growths-and-vascular-lesions/dermatofibroma
Cleveland Clinic. Dermatofibroma. https://my.clevelandclinic.org/health/diseases/22909-dermatofibroma
This handout is for general education and does not replace advice from your own provider. Always follow your provider’s specific instructions.
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