Dermatofibrosarcoma Protuberans vs Dermatofibroma

How to tell the difference — key features compared side by side.

Feature
Dermatofibrosarcoma Protuberans
Dermatofibroma
Category
Malignant
Benign
Key feature
Rare slow-growing tumor of the dermis. Looks like a firm plaque or nodule on the trunk - low metastatic potential but high local recurrence.
Firm, small brown bump - usually on the legs. Harmless. The dimple sign is its signature feature.
Risk factors
Age 20-50 (most common in young to middle-aged adults); No clearly established environmental risk factors; Previous trauma or surgical scars at the site (debated)
Female sex (more common in women); Young to middle-aged adults; Prior minor skin trauma (insect bites, shaving nicks)
Action needed
A slowly growing, firm plaque or nodule on the trunk or limbs
A nodule larger than 1-2cm or growing progressively (may be DFSP)

Dermatofibrosarcoma Protuberans

Dermatofibrosarcoma protuberans (DFSP) is a rare soft tissue sarcoma that begins in the dermis (middle layer of skin). It most commonly appears on the trunk (40-50% of cases), followed by the extremities and head/neck region.

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Dermatofibroma

Dermatofibroma is a common, harmless, firm nodule that typically appears on the lower legs of women, though it can occur anywhere. It presents as a small (usually under 1cm), firm, slightly raised, brownish bump that feels like a hard lump under the skin.

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Does yours look more like dermatofibrosarcoma protuberans?

Quick self-check

Does this look like dermatofibrosarcoma protuberans? Answer 2 questions.

Is it a firm, slowly growing plaque or nodule on the trunk?

Has it been growing gradually over months or even years?

Still not sure?

Our full ABCDE checker evaluates 5 clinical criteria dermatologists use.

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