Keratoacanthoma on the skin of a 75-year-old man. A keratoacanthoma is a harmless, hard nodule which appears on the skin, mainly on the face. The nodule grows to a diameter of 1-2 centimetres over about 6 weeks and then gradually disappears over the next few months. Men are affected more commonly than women, mainly between 50 and 70 years of age. The nodule may be removed surgically to prevent unsightly scarring.
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