What is an example of a benign hyperkeratotic skin lesion?

An example of a benign hyperkeratotic skin lesion is a seborrheic keratosis. Seborrheic keratoses are common, non-cancerous skin growths that are often referred to as "age spots" or "barnacles". They are caused by an overgrowth of the keratin-producing cells in the epidermis, the outermost layer of the skin. Seborrheic keratoses typically appear as brown, black, or tan growths on the face, chest, back, and arms. They are usually round or oval in shape and can vary in size from a few millimeters to several centimeters. Seborrheic keratoses are harmless and do not require treatment, but they can be removed for cosmetic reasons.