Chronic keratotic lesions on adult skin that has been chronically exposed to ultraviolet rays.
Has the potential to progress into an invasive squamous cell carcinoma (SCC).
Although diagnosed clinically, a biopsy may help rule out SCC.
Treatment consists of destructive methods (e.g., cryotherapy with liquid nitrogen, curettage with or without electrodesiccation, chemical peels, and photodynamic therapy) or topical medication (e.g., topical fluorouracil, imiquimod, diclofenac, or tirbanibulin).
Actinic keratosis (AK) lesions are skin-colored, yellowish, or erythematous, ill-defined, irregularly shaped, small, scaly macules or plaques localized in sun-exposed areas of the body. Typically, they occur in middle-aged or older men with light-colored skin and a history of chronic sun exposure. They have the potential to progress into squamous cell carcinoma (SCC).
History and exam
Key diagnostic factors
- single or multiple scaly macules or plaques
- scaly lesions with a hyperkeratotic surface
- well-defined, scaly, brown lesions
- lesions resembling seborrheic keratosis, melanocytic nevus, and early malignant melanoma
- hypertrophic conical-shaped protuberances growing from the surface of the skin
- scaly red roughness with induration, fissuring, and ulceration of the lower lip to the commissures
- lesion on sun-exposed area of body
- skin-colored, papillomatous, elevated wartlike papules
- plaques with very mild scale over very thin shiny skin
- violaceous well-defined papules with fine white lines on the surface
Other diagnostic factors
- evidence of sun damage to skin
- pruritus or bleeding
- chronic exposure to UVB radiation
- light-colored skin, freckling, and albinism
- age >40 years
- male sex
- xeroderma pigmentosum
Investigations to consider
- skin biopsy
confluent scalp lesions
head and face lesions, excluding periorbital, actinic cheilitis, and confluent scalp lesions
persistent or severe actinic cheilitis
back of hands
below the knee
- Squamous cell carcinoma (SCC) in situ (Bowen disease)
- Invasive SCC
- Focused update: guidelines of care for the management of actinic keratosis
- Guidelines of care for the management of actinic keratosis
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