Acute irritant contact dermatitis

Paederus dermatitis. Acute contact dermatitis may occur after accidental exposure to an insect belonging to the genus Paederus, common in the tropical regions. The insect does not sting or bite, but accidental crushing may release its hemolymph that contains pederin, a potent vesicant.
(A) Well-defined, erythematous patches with central hyperpigmentation and vesicles in a kissing lesion fashion.
(B) Well-defined, linear, erythematous patch with central vesicles and pustules.