A keratosis seborrheic is a benign (noncancerous) skin growth that occurs frequently. They tend to proliferate as people get older. Black, brown, or light tan keratosis seborrheic are common. Moreover, the lesions seem greasy or scaly and are slightly elevated, and they commonly occur on the face, chest, neck, or back in stages.
Keratosis seborrheic is not infectious and is not harmful. They don’t need to be treated, but if they become irritated by clothes or you don’t like how they appear, you may want to have them taken.