Onchocerca Volvulus via female blackfly. Black flies, black skin nodules, "black sight" (aka Blindness). Question stem here describes the black nodules seen in Onchocerca.
why can't it be culex mosquito? maybe wuchereria bancrofti filariasis?
For Pictures: https://emedicine.medscape.com/article/1109409-clinical#b2
Microfilariais an early stage in the life cycle of certain parasitic nematodes in the family Onchocercidae.--wiki