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'Damned If You Do'
"House"-hold name: Elizabeth Mitchell as Sister Augustine.
"House"-lights: Sister Augustine is a nun who develops a rash -- the other nuns think it is stigmata, but House knows it has to be some kind of allergy. After nearly killing her testing for various things, they discover it is actually her copper IUD birth control device still embedded in her uterus (presumably from before her time as a nun). When the device is removed, she fully covers.
Out-"House": Elizabeth Mitchell got quite the upgrade in hairdos when she went on to play Juliet on "Lost."