The human botfly looks like a bee, but it has more hair and fewer bristles. They usually only attack livestock, deer, and humans. The female fly attaches her eggs to mosquitoes, other flies, and insects, which carry the eggs to the host.
Body warmth causes these eggs to hatch, and then the larvae begin to penetrate the skin. These flies are usually responsible for the loss of beef in tropical America.
The larvae of human botflies cause a raised lesion in the skin that is painful, and the area usually becomes hard. Sometimes, when the patient takes a shower or covers the wound, they can feel the larvae moving.
The larvae are usually removed by a simple surgical procedure that includes local anesthesia. The larvae can also be popped out by applying pressure but only in certain cases. Antibiotics are given after the procedure, and the wound will normally heal in less than two weeks.