Actinic Keratosis
- Provides an overview of symptoms, treatment, and prevention, as well as photographs of lesions on the arms, scalp, and ear.
- http://www.ehendrick.org/healthy/1/000827.htm

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.
- http://www.healthopedia.com/actinic-keratosis/

Solar Keratosis
- An outline of the condition and the need for treatment, with a link to a series of photographs.
- http://www.skinpatient.com/ptinfo/S/solarkeratosis.htm

Sun Damage
- Explains how pre-cancerous lesions develop, their risk factors and treatment, and includes photographs of these and similar conditions.
- http://www.dermatology.co.uk/sun/sundamage/

eMedicine: Actinic Keratosis
- Describes the risk factors, appearance, pathology, treatments, and possible outcomes. Includes photographs of treated and untreated lesions.
- http://emedicine.com/derm/topic9.htm