Cutaneous Horn vs Actinic Keratosis

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

Feature
Cutaneous Horn
Actinic Keratosis
Category
Pre-cancerous
Pre-cancerous
Key feature
Hard cone-shaped keratin projection. The horn is harmless - but 16% hide cancer at the base.
Rough, sandpaper-like patches from years of sun damage. The most common precancer - 5-10% progress to squamous cell carcinoma.
Risk factors
Chronic sun exposure; Fair skin; Age over 60
Cumulative lifetime sun exposure; Fair skin, light hair, light eyes (Fitzpatrick I-III); Age over 40
Action needed
Any hard horn-like projection from the skin
Any rough scaly patch on sun-exposed skin persisting more than two weeks

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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Actinic Keratosis

Actinic keratosis (AK) is the most common precancerous skin lesion, affecting an estimated 58 million Americans. It develops from cumulative ultraviolet radiation damage and represents the earliest stage toward squamous cell carcinoma.

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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 →