A skin-colored projection made up of hardened keratin, the principal component of skin, hair, and nails. Cutaneous horns most commonly appear on the head or face. Often they accompany actinic keratosis.
A hard, horny outgrowth from the skin. It is slow-growing, benign, and may be small or large, 10 to 12 cm, in diameter.
A hard, noncancerous protrusion sometimes observed on the skin of elderly individuals is called a seborrheic keratosis. It results from the overgrowth of keratin and can vary in color, ranging from yellow to brown or black. These growths may appear at the site of a previous wart and tend to develop slowly. If left untreated, they can grow significantly, and in such cases, surgical removal might be recommended.