Seborrheic keratosis is a skin growth that appears in adulthood. Although they may be large and grow quickly, they are benign. They are not caused by sun damage so can be found on areas that are also usually covered by clothing. Seborrheic keratosis tends to be genetic. Initially, they appear as slightly raised, light brown spots and evolve into darker, thicker lesions with rough, warty surfaces.
Typically, doctors can diagnose seborrheic keratoses just by looking at them. If there is any uncertainty about it being cancerous
, they will likely take a biopsy (remove a small part of it) and examine it under a microscope. The risk of developing these lesions increases with old age and a family history of developing them.
Though they are not directly caused by sun damage, and are often found in areas that are usually covered by clothing, there may be a link between levels of sun exposure and seborrheic keratosis.