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Dirofilariasis is a form of filariasis (see this term), caused by the filarial nematode of the genus Dirofilaria (including Dirofilaria repens, Dirofilaria immitis), which is transmitted by mosquitoes. The disease is characterized by the presence of subcutaneous nodules (or a conjunctival form that develops slowly and that can be painless to tender), edema and erythema at the site of parasite localization, a feeling of 'crawling' under the skin, and the ''Calabar'' swelling (similar to thatin loiasis (see this term). The latter may last a few days and recurrences are possible. Common localizations of dirofilaria are head and neck, most commonly in the periorbital region, the limbs and trunk.