Caused by Diptera species. Dermatobia hominis (botfly) is most common cause in North America
Cutaneous (includes follicular, wound, and migratory) type is most common
Can also occur in mouth, urogenital, ophthalmic, nasopharyngeal location
Typically occurs in tropical and subtropical areas. US cases typically due to travel to endemic region
Bacterial superinfection is rare
Can also occur in mouth, urogenital, ophthalmic, nasopharyngeal location
Myiasis
Papules
Volvulus 
Insect bites
Volvulus
Scabies
Fecal impaction
Seabather's eruption