Lepidopterism caused by the puss caterpillar.

Lepidopterism is a term inclusive of cutaneous and systemic reactions resulting from moths, butterflies, and larva. The puss caterpillar is the larval form of the southern flannel moth, Megalopyge opercularis. A case presentation is reviewed and treatment options presented for contact with puss caterpillars and other stinging caterpillars encountered in the primary care setting. Contact with the puss caterpillar causes a characteristic rash and can produce extreme symptoms of pain for its victims. Accurate and early diagnosis can expediate treatment to alleviate symptoms and decrease morbidity in those affected and aid in differential diagnosis of various stinging caterpillars.