what is a seborrheic keratosis
Multiple seborrheic keratoses on the dorsum of a patient with LeserâTrÃ©lat sign. [edit on Wikidata] A seborrheic keratosis, also known as seborrheic verruca or a 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 centimetres (1 in) across.