Calabar swelling is produced by-

Calabar Swelling: Localized angioedema and erythema usually on the extremities, characterized by fugitive, swollen lumps of subcutaneous tissue caused by a parasitic filarial worm (Loa loa) endemic to Central and West Africa. The swollen areas migrate with the worm through the body at a speed of about 1 cm per minute and may become as large as a small egg.