Symptoms of an infested bot fly larvae include a raised lesion on the skin that is hard and in many instances painful. When the lesion is covered, preventing the larvae from getting air, the infested can feel the larvae moving. A physician can confirm the diagnoses.
One way to remove the bot fly larvae is to have a simple surgical procedure, a scalpel cuts a slit in the lesion and the larvae is removed. Another method includes covering the wound with petroleum jelly or other thick substance that blocks the air to the larvae. The larvae comes up to breathe and tweezers or forceps are used to extract it.