Cutaneous Horn vs Seborrheic Keratosis

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

Feature
Cutaneous Horn
Seborrheic Keratosis
Category
Pre-cancerous
Benign
Key feature
Hard cone-shaped keratin projection. The horn is harmless - but 16% hide cancer at the base.
Waxy, stuck-on growths - the most common benign tumor in adults over 50. Harmless but frequently mistaken for melanoma.
Risk factors
Chronic sun exposure; Fair skin; Age over 60
Age over 50 (prevalence approaches 100% in elderly); Genetic predisposition (strong familial tendency); Sun exposure may play a role in some cases
Action needed
Any hard horn-like projection from the skin
Only if you are unsure whether a growth is SK or melanoma

Cutaneous Horn

A cutaneous horn is a hard, conical keratin projection from the skin surface. It can range from millimeters to several centimeters. The horn itself is just keratin - the critical question is what lies at the base.

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Seborrheic Keratosis

Seborrheic keratosis (SK) is the single most common benign skin tumor, affecting nearly all adults over 60. They appear as waxy, raised, brown or tan growths that look as though they have been pasted or stuck onto the skin surface.

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Does yours look more like cutaneous horn?

Quick self-check

Does this look like cutaneous horn? Answer 2 questions.

Is there a hard horn-like projection sticking up from the skin?

Is it on a sun-exposed area like face or ears?

Still not sure?

Our full ABCDE checker evaluates 5 clinical criteria dermatologists use.

Full ABCDE check →