Seborrheic keratoses (SKs) are common skin growths. These benign (non-cancerous) growths can occur almost anywhere on the skin. Some people get just one; others develop many. Having many SKs is more common.

Usually beginning as small, rough bumps, SKs tend to eventually thicken and develop a warty surface. Most are brown, but these growths range in color from light tan to black. Some SKs measure a fraction of an inch; others are larger than a half-dollar. A SK can be flat or raised. Sometimes the surface feels smooth.

What often distinguishes these growths from other lesions is a waxy, pasted-on-the-skin appearance. A SK can look like a dab of warm, brown candle wax on the skin. It also may resemble a barnacle attached to a ship. Either way, SKs tend to have that stuck-on-the-skin appearance.

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