What exactly is happening in this striking cover illustration by the great Berni Wrightson? I thought that Cousin Abel was using his finger as a makeshift candle, which emits haunted smoke. But looking at it closer it almost looks like he's closely investigating some toxic snot, or sentient puss, or noxious ooze or something. The little ghostly smoke is telling, but of what I cannot say. What am I looking at? Help me please.