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Seborrheic keratoses are the most common benign  skin growths.  They can develop anywhere on the skin but are most common on the face, chest and back.  Seborrheic keratoses generally begin to develop around age 40, and by 65 yrs of age 95% of people have at least one.

Individual lesions are most often brown and warty, but they can be pink, black, or a combination of colours.  They are growths of epidermal cells, the cells that make up the top layer of the skin.  It is currently not known what causes seborrheic keratoses, but it is thought that genetics probably plays a role. People who have lots of these growths often have a parent who had them too.

Seborrehic keratoses are benign growths that do not transform in to skin cancer.  They do not need to be removed unless they are bothersome.  Some people do not like their appearance and choose to remove them for aesthetic reasons.  

There are several methods than can effectively remove seborrheic keratoses.  Most commonly the spots are frozen with  Liquid nitrogen.  They then form scabs which fall off in 1-4 weeks, taking the keratoses with them.   Other treatments used include electrodessication and surgical excision.