A seborrheic keratosis grows gradually. Signs and symptoms might include: 
A round or oval-shaped waxy or rough bump, typically on the face, chest, a shoulder or the back
A flat growth or a slightly raised bump with a scaly surface, with a characteristic "pasted on" look
Varied size, from very small to more than 1 inch (2.5 centimeters) across
Varied number, ranging from a single growth to multiple growths
Very small growths clustered around the eyes or elsewhere on the face, sometimes called flesh moles or dermatosis papulosa nigra, common on Black or brown skin
Varied in color, ranging from light tan to brown or black
Itchiness
