What skin condition is characterized by greasy keratotic lesions in individuals over 50?

Seborrhoeic keratosis is indeed characterized by greasy, keratotic lesions, commonly affecting individuals over the age of 50. These lesions present as well-defined, raised, and often pigmented areas on the skin that resemble warts. They typically have a scaly or "greasy" appearance and can vary in color from light tan to black.

These growths are benign and are a normal part of the aging process, reflecting the accumulation of skin cells. Unlike other skin conditions like actinic keratosis, which is characterized by rough, scaly patches due to sun damage and has a potential for malignancy, or basal cell carcinoma, which is a type of skin cancer that presents differently, seborrhoeic keratosis is not malignant and does not pose any health risks.

In comparison, psoriasis tends to present with well-defined red patches covered in silvery scales and can affect individuals at various ages. Seborrhoeic keratosis distinctly lacks the inflammatory component seen in psoriasis and typically indicates a benign proliferation of skin cells associated with aging. Therefore, the defining features of seborrhoeic keratosis align with the characteristics mentioned in the question.