 The manufacture of pederin is largely confined to adult female beetles—larvae and males only store pederin acquired maternally (i.e., through eggs) or by ingestion.Skin contact with pederin from the coelomic fluid exuded from a female Paederus beetle causes Paederus dermatitis.This is a rash that varies from a slight erythema to severe blistering, depending on the concentration and duration of exposure.