A seborrheic keratosis is a noncancerous benign skin growth that originates in keratinocytes. Like liver spots, seborrheic keratoses appear more often as people age. In fact they are sometimes humorously referred to as the “barnacles of old age”.

Seborrheic Keratoses
seborrheic keratoses - before seborrheic keratoses - after
Before After

They appear in various colors from light tan to black. They are round or oval, feel flat or slightly elevated, and range in size from very small to more than 2.5 centimetres (1.0 in) across.

They can resemble warts, though they have no viral origins. They can also resemble melanoma skin cancer, though they are unrelated to melanoma as well. Because 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”. However these lesions are usually not associated with HPV and therefore such nomenclature should be discouraged.

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