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Rough scaly spots on sun-damaged skin are called solar keratoses. They are also known as “actinic keratoses”. They should be distinguished from other kinds of keratosis (scaly spot) such as seborrhoeic keratosis, porokeratosis and keratosis pilaris.

Solar keratoses are a reflection of abnormal skin cell development due to exposure to ultraviolet radiation. They are considered precancerous.

They appear as multiple flat or thickened, scaly or warty, skin coloured or reddened lesions. A keratosis may develop into a cutaneous horn.

They are very common on sites repeatedly exposed to the sun especially the backs of the hands and the face, most often affecting the nose, cheeks, upper lip, temples and forehead. On the lips they are often called actinic or solar cheilitis. They are especially common in fair-skinned persons or those who have worked outdoors for long periods without skin protection. Sun-damaged skin is also dry, discoloured and wrinkled.

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