Hairs (setae)from females of the moth Hyelsia metabus can result in a allergic dermatitis if the hairs penetrate the skin. This is a form of lepidopterism (see above) that occurs in South America.
Clinical features:
(1) presence of large numbers of the moth Hyelsia metabus
(2) onset of an intense pruritis in areas of exposed skin (face, neck, arms, etc)
(3) development of a papulvesicular rash in affected areas
(4) The dermal reaction is self-limiting and responds to topical steroid cream after bathing.
(5) Less often an allergic conjunctivitis or respiratory complaints may occur.
Risk factors:
(1) shining lights at night (attract moths)
(2) handling moths with bare hands
(3) limited washing facilities (decreased ability to wash hairs off)
(4) physical labor (abrasions drive hairs into skin)
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