The Sting of a White Flannel Moth Caterpillar (Norape ovina).

The purpose of this report is to describe a case of urticarial dermatitis, or erucism, caused by the white flannel moth caterpillar (Norape ovina) in central Virginia. Many caterpillars are known to cause erucism, with the puss caterpillar (Megalopyge opercularis) being the most reported culprit in the United States. White flannel moth caterpillars are expected to cause erucism as they belong to the same family as the puss caterpillar (Megalopygidae) and have similar venom-containing hairs, but no reports of the reaction or clinical course have been documented in the medical literature.