Actinic keratosis (also called solar keratosis, senile keratosis, or AK) is a premalignant condition of thick, scaly, or crusty patches of skin. It is most common in fair-skinned people who are frequently exposed to the sun, because their pigment isn't very protective. It usually is accompanied by solar damage. Since some of these pre-cancers progress to squamous cell carcinoma, they should be treated.
When skin is exposed to the sun constantly, thick, scaly, or crusty bumps appear. The scaly or crusty part of the bump is dry and rough. The growths start out as flat scaly areas, and later grow into a tough, wart-like area.
An actinic keratosis site commonly ranges in between 2 to 6 millimeters, and can be dark or light, tan, pink, red, a combination of all these, or the same pigment of ones skin. It may appear on any sun-exposed area, such as the face, ears, neck, scalp, chest, back of hands, forearms, lips etc.
More on [ Actinic keratosis ]

Actinic Keratosis - Provides an overview of symptoms, treatment, and prevention, as well as photographs of lesions on the arms, scalp, and ear.
eMedicine: Actinic Keratosis - Describes the risk factors, appearance, pathology, treatments, and possible outcomes. Includes photographs of treated and untreated lesions.
Meta Description: [ Actinic Keratosis - Actinic keratosis is the most common sun-related growth. An estimated 60% of individuals older than 40 years who are predisposed have at least one actinic keratosis or solar keratosis. Usually, these people are fair-skinned, burn easily, and tan poorly, as well as have occup... ]
Guidelines of Care for Actinic Keratoses - Evidence-based recommendations from the American Academy of Dermatology. Includes detailed clinical advice for diagnosis and treatment.
Healthopedia.com: Actinic Keratosis - A detailed explanation covering symptoms, diagnosis, management, and outcomes. Includes discussion of the possible side effects of treatment, as well as the consequences of leaving them untreated.
Solar Keratosis - Patient fact sheet explains causes, appearance, diagnosis, risks, and treatment.
Meta Description: [ A solar keratosis is a small lump on the skin which is caused by a lot of exposure to sun over the years. Several may develop. They are usually harmless, but can be unsightly. Treatment is usually advised as there is a small risk that a solar keratosis may eventually turn into skin cancer. ]
Solar Keratosis - An outline of the condition and the need for treatment, with a link to a series of photographs.
Sun Damage - Explains how pre-cancerous lesions develop, their risk factors and treatment, and includes photographs of these and similar conditions.
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