Rodent mite bites leave multiple groups or individual small itchy papules (around 1–2 mm in diameter) on the skin (papular urticaria). These are found mostly "on the upper extremities, neck, upper trunk and face".
Diagnosis requires species identification of the parasite, which will be likely to be found in the environment of its host rather than on the hosts’ skin. Rodent mites are very small, for O. bacoti "female mites reach a size between 0.75 and 1.40 mm, males are a little smaller".
The original rodent host of the mites must be located and eradicated, and their nests removed. Steps should also be taken to prevent future infestations, such as by blocking the rodents means of entry into the building. The patient's environment should then be treated, using both non-residual and residual insecticides, mites crawling in the open can be removed by vacuuming or with a cloth moistened with alcohol.
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