Solar keratoses are premalignant lesions that arise on the sun exposed areas of the skin. Clinically, solar keratoses appear as dry, rough and adherent scaly lesions. Occasionally, solar keratoses produce a circumscribed conical hyperkeratotic excrescence, which is known as a cutaneous horn. A solar keratosis is considered to be premalignant as it may develop into a squamous cell carcinoma.
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