Seborrheic keratosis

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Seborrheic keratoses on the back

Image of seborrheic keratoses on the back

Seborrheic keratoses are very common on the back. They appear as waxy light tan, brown or black growths that look as if they were dripped onto the skin by a candle. Some can grow large, up to 1 inch (2.5 centimeters) across.
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