Bed bugs are obligatory bloodsucking. They have mouth parts that saw through the skin, and inject saliva with anticoagulants and painkillers. Sensitivity of humans varies from extreme allergic reaction to no reaction at all (about 20%). The bite usually produces a swelling with no red spot, but when many bugs feed on a small area, reddish spots may appear after the swelling subsides.[15] Bedbugs prefer exposed skin, preferably the face, neck, and arms of a sleeping person.
I live in a high rise apt bldg. There have been reports of bed bugs since I moved in two years ago. Recently it was my turn. I see no bugs, but man o man did they have a feast on my legs, and inner thighs. I went for the ammonia trick. The only thing I had was window cleaner. It helped stopped the itch temporarily. Then I’m good for some hours. When the itch comes back, I douse again in Blue window cleaner again. Strange but true.
Cutaneous reactions to bedbug bites can vary widely and are easily confused with other conditions (Table 1).15–19 A typical lesion is a 2- to 20-mm, pruritic, erythematous maculopapule with a central hemorrhagic crust or vesicle.5,8 Macules, papules, wheals (Figure 3), vesicles, bullae, and nodules have all been reported,20 as have asymptomatic lesions with a barely visible punctum as the only evidence of a bite.8 Bites vary in number and are preferentially distributed in unclothed areas (e.g., face, neck, extremities). Unlike many other arthropod and insect bites, bedbug bites are rarely located in the popliteal fossae or axillae.21 Lesions can be noticeable immediately when waking up or several days later, with the reaction often progressing from delayed to immediate with subsequent exposures22–26  (Table 2). The classic bedbug rash is referred to as “breakfast, lunch, and dinner” because it commonly presents as several bites in a row or cluster 20 (Figure 4).
Bed bugs were mentioned in ancient Greece as early as 400 BC, and were later mentioned by Aristotle. Pliny's Natural History, first published circa AD 77 in Rome, claimed bed bugs had medicinal value in treating ailments such as snake bites and ear infections. (Belief in the medicinal use of bed bugs persisted until at least the 18th century, when Guettard recommended their use in the treatment of hysteria.[51])

I am apparently allergic to these things. My bites swell to huge sizes and I get red marks running up my arms and it itches like crazy, almost like a burning itch. However, doing some research I found an effective way to stop the itch. Its not for everyone, but for someone like me who can’t even touch the shells (my fingers have gotten swollen searching for the damn things), this works for me. Again, not for everyone:

I have a situation were I have been infested in my room,I have been beaten and I have red spots all over my body, is itching at night and affected my sleeping time, I spoke to the landlord to get a treatment but they dont seem to care much, should I move to a diferent place? What do I need to do in order not to be follow into the new place? Any recomendation out there?
Our apartment is clean, but apparently this has little to do with it. We were told to put our dry clothes in the clothes dryer for 30 minutes at a high heat and bag them tightly, spray rubbing alchoha l92% to repel them from the bed , couch covers and seat cushions, as well as to dry our bedding, curtains, towels etc., and to remove the light covers from the plugs. They were reasonable (about$400 divided into monthly payments.)They will come twice, a month apart beginning two days from now, We’ve been vacuuming daily, and tightly securing debris. We were told that rubbing alcohol, sprayed in cushions and the bottom of shoes will repel them (92%). I was told that the most common place to pick them up is hospital and doctor’s waiting rooms. I write, and have a lot of boxed papers. I’ve emptied my drawers. I’m also not sure of what to do about my hanging paintings. I have enough problems right now, and just want this to end.
Some bed bug species are parasites of bats or birds, and may bite people if the wild hosts are no longer available. Although similar in overall appearance, the species of bed bugs that normally feed on bats, swallows, chimney swifts, pigeons or other wild hosts can be differentiated from those that prefer humans. Entomologists and knowledgeable pest managers can make this determination. If bat bugs or bird bugs are present, roosting and nesting sites should be the primary focus, and the animals should be removed and excluded from the building. 
Wash all things washable and leave in HOT dryer for at least 20 minutes. The old timers used to sun dry and air their hand made quilts outside in the sun all day and bring them in before the dew would start to settle. they also did their mattresses and pillows and cushions and this must have heated up things a bit but be careful that the sun doesn’t fade the color.
One bed bug will usually take more than one bite. Once a bed bug inserts its mouthparts and finds a suitable blood vessel, it will begin feeding. However, finding the right blood vessel may take more than one injection into the skin. In addition, bed bugs are very sensitive to movement by the host they are feeding on. Therefore, if a sleeping person moves, a feeding bed bug will probably withdraw its mouthparts and begin its search for a blood meal on another part of the body. It’s important to remember that the number of bites a person receives is not indicative of the number of bed bugs that feed on that person.