He is said to be so dark that his skin appears to be blue.

His skin appeared dull and sagged, as though he hadn't slept at all.

They wore no clothing and their skin appeared to be leathery.

If they do, and then look at, say, a hand on a mouse, their skin will appear to crawl.

The skin appeared to be peeling off the face.

Though he was clearly unable to move, his skin appeared to be writhing.

Their skins bleached, turned white, then appeared to become transparent.

The skin appeared to be made of flesh, not rubber or plastic.

Radiation in particular can make skin appear burned and irritated.

Her gray skin appeared to fall, to melt away.