Dermatobia hominis, the human botfly, is the only species of botfly known to use humans as the host to its larvae.
In cattle, the lesions caused by these flies can become infected by Mannheimia granulomatis, a bacterium that causes lechiguana, characterized by rapid growing, hard lumps beneath the skin of the animal. Without antibiotics an affected animal will die within 3–11 months.
Certain type of Botflies can occasionally use humans as the host to its larvae. The larva, because of their spines, can pose an extremely painful sub-epidermal condition. Removal processes include placing raw meat on to the area, which in theory will coax the larva out.Another option is to use the tree sap of the matatorsalo, found in Costa Rica, which will kill the larva, yet leave its body in the skin. Additionally, one can attempt to seal the breathing hole of the larva with nail polish or vaseline and then, after a day, squeeze out the suffocated, dead larva. Use of adhesive tape can work, but carries additional risk of infection because portions of the larva's breathing tube can be broken off by the tape and made difficult to remove.
youtube : Monster "Alien" Human Bot Fly Removal