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.
A seborrheic keratosis isn’t dangerous, but you shouldn’t ignore growths on your skin. It can be difficult to distinguish between harmless and dangerous growths. Something that looks like seborrheic keratosis could actually be melanoma.Onset is usually in middle age, although they are a common finding in younger patients found in 19 % of 15 to 25 year olds making the term senile keratosis a misnomer.
Thin seborrheic keratoses on facial skin can be very difficult to differentiate from lentigomaligna even with dermatoscopy.Visual diagnosis is made by the stuck on appearance, horny pearls or cysts embedded in the structure. Darkly pigmented lesions can be challenging to distinguish from nodular melanomas.