Human bot flies are one of several different species of bot fly that affect a wide variety of mammals. Bot flies lay their larvae in the human skin through an intermediary species, the mosquito. The bot fly captures the mosquito, attaches its eggs to the mosquito and then releases it. When the mosquito makes contact with a human being the eggs hatch and the larvae fasten themselves to the skin, where they then burrow in, often through the hole left by the mosquito, and make a home for themselves.
Cover the hole of the bot fly with the duct tape. Wait for 24 hours, or if the bot fly larvae is developed enough for you to feel it moving, wait until it stops moving.
Remove the duct tape. If you can see the bot fly larvae at the surface, that's good. If you cannot see the larvae, squeeze the wound like you would to pop a zit until the larvae begins to emerge.
Grab hold of the bot fly larvae with the tweezers and gently, slowly pull the larvae free from your skin. If you pull too fast you risk ripping the larvae in half, which can cause an infection.