Most incidents the E.P.A. noted were minor, involving skin, eye or respiratory irritation ... But the toxic side effects of DEET are far less common than what can occur with insect-borne illnesses ...

Researchers at the University of Massachusetts Amherst say a naturally occurring compound secreted by the skin of donkeys can ...

But the watchdog warned that a high concentration of DEET might cause rashes, blisters and skin and mucous membrane irritation, with children being more susceptible to the side effects.