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Actinic keratosis is a premalignant skin lesion resulting from proliferation of atypical epidermal keratinocytes. Actinic keratoses are very frequent and their prevalence is increasing. Risk factors for actinic keratosis include intrinsic and environmental factors, particularly exposure to ultraviolet radiation and advanced age. The main factor is the exposition to ultraviolet radiation. Better sun protection decreases the risk of actinic keratosis and also the risk of progression to squamous cell carcinoma, even though not all actinic keratoses progress to invasive squamous cell carcinoma. A diagnosis of actinic keratosis should encourage patients to do an annual dermatological screening of skin cancers. Given the economic cost of actinic keratoses, a global approach of health authorities could be interesting for their management. © 2019 Elsevier Masson SAS. All rights reserved. Cet article fait partie du numéro supplément Kératoses actiniques : comprendre et traiter réalisé avec le soutien institutionnel de Galderma International.