Many microscopic bugs bite humans. The following are some of the possibilities: scabies, no-see-ums (biting midges), thrips, mites, sand flies, bed bugs, lice and fleas. How to kill them tends to be insect-specific. Some treatments have to be pretty severe to kill the insect, so this problem does not really lend itself to trial and error. It is best to identify the insect first before proceeding with extermination.
Show your doctor any bite marks. She may be able to identify them immediately and give you a prescription--or at least give you the name of the insect so that you can research home remedies.
Use clear adhesive tape to lift the insects off your skin if there are no bite marks to show your doctor. Take it to the biology, etymology (insects) or agriculture department of your local college to get it identified.
Research on eHow or elsewhere for home remedies to kill the insect identified.
Kill bed bugs, which leave blood stains on your bedding, by putting your bed's legs in cups of diatomaceous earth.
Kill scabies, which leave chicken pox-like red dots, by applying a solution of half a litre of 1 per cent hydrogen peroxide (diluted from the standard 3 per cent) mixed with 2 tbsps. of borax. Apply to affected areas once a day after bathing and drying the skin.
Kill lice with regular combing with a metal lice comb over the toilet and twice-a-week application of Denorex Extra Strength Shampoo, leaving it lathered in the scalp for 10 to 30 minutes at a time. Protect the ears and neck from the burning of the shampoo with vaseline. Three weeks of application should be enough.
Treat bites that are concentrated around your ankles (likely to be fleas) by steam cleaning the carpets and treating your pet with flea shampoo and a flea collar.
Wash all linens with bleach on the hottest washer and dryer settings, regardless of the diagnosis. Wash clothing on the hottest settings. What can't be washed by machine (e.g. headphones or plush toys) put in airtight plastic bags for 1 to 2 weeks to starve the insects to death.