A seborrheic keratosis also known as seborrheic verruca and senile wart is a benign skin tumor that originates from keratinocytes. Like liver spots, seborrheic keratoses are seen more often as people age.The lesions appear in various colors, from light tan to black. They are round or oval, feel flat or slightly elevated like the scab from a healing wound, and range in size from very small to more than 2.5 cm.
The average age of patients suffering from lesions with and without associated malignancy was 57 and 54 years,the approximate rate is highest with a prevalence of around 50% and the rate is estimated to be between 11% and 26% Seborrheic keratoseson exposed areas were more often flat and more than 3 mm in diameter than those on the non-exposed areas.
Only the top layers of the epidermis are involved, seborrheic keratoses are often described as having a pasted on appearance. Some dermatologists refer to seborrheic keratoses as seborrheic warts these lesions, however, are usually not associated with HPV,and therefore such nomenclature is discouraged.