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Int J Dermatol. 2009 Feb;48(2):128-31. doi: 10.1111/j.1365-4632.2009.03876.x.

An outbreak of 268 cases of Paederus dermatitis in a toy-building factory in central China.

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Department of Dermatology, Affiliated Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.



To evaluate the clinical features of and to identify the pathogen responsible for an outbreak of acute dermatitis in a toy-building factory in Chibi city, central China.


Physical examinations were carried out on all the factory staff. Records were made. The factory district, its surrounding environment and the accommodation conditions were investigated. The insects collected in the area were identified by a parasitologist at the Department of Parasitology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan.


Two hundred and sixty-eight cases of Paederus dermatitis were diagnosed in a total of 316 staff at the toy-building factory. The total incidence rate was 84.81%. The incidence rates in administrators and workers were 43.75% and 87%, respectively. The face and neck were the most common sites of involvement. The most common lesions consisted of linear erythema and papulopustules. In 71.27% of patients, more than one lesion was present.


This outbreak of acute dermatitis was diagnosed as Paederus dermatitis caused by Paederus fuscipes. The favorable environment, lighting, humidity, and poor accommodation may have been responsible for the outbreak. Increased public awareness of this condition may decrease the incidence of Paederus dermatitis.

[Indexed for MEDLINE]

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