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Actinic keratosis is primarily associated with which of the following characteristics?
Dark skin coloration
Firm, red nodules
Presence of blisters
Unusual pigmentation
The correct answer is: Firm, red nodules
Actinic keratosis is primarily characterized by firm, red nodules that arise due to prolonged exposure to ultraviolet (UV) light, usually from the sun. These lesions are considered precursors to skin cancer, particularly squamous cell carcinoma. They typically present as rough, scaly patches or nodules on sun-exposed areas of the skin, such as the face, ears, scalp, and backs of the hands. The firmness of the nodules distinguishes actinic keratosis from other skin conditions. Additionally, these lesions may vary in color, but the prevailing appearance includes a reddish hue and a slightly raised texture. Recognizing the signs and characteristics of actinic keratosis is essential for early intervention and prevention of more severe skin cancers.