Definition: a polymorphous, bullous eruption, more common on the extremities and abdomen than on the upper trunk, with the appearance of pemphigoid or dermatitis herpetiformis; beginning in the second or third trimester, flaring about the time of delivery and subsequently resolving; usually recurrent during subsequent pregnancy. Linear C3 is shown in the epidermal basement membrane by direct immunofluorescence. Not caused by viral infection.
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Examples: glitazone, GI cocktail, etc.