Encasing mattresses is one of many good parts of a solution, but it doesn't get rid of the infestation. There are going to be other bugs away from the mattress, hiding nearby. What mattress covers are good at is entombing the sometimes large number of bed bugs that can live on a mattress. And because the covers tend to be uniform in color and don't have a lot of seams that the bugs can hide in, it's easier to see the insects.
I have various skin lesions which might or might not be bed-bug bites–small, raised, sometimes red, sometimes itchy. The problem is I live right next door to a large park and get all kinds of insects in summer, may small enough to get through my window-screen. Also, I have Parkinson’s disease, and the meds I take for it can produce hives and itching as a side-effect. And, my bedding and mattress are all dark colored, so I likely would not see fecal stains or shed bed-bug skins.
Apply as a coarse, low-pressure spray to harborage areas including crevices, baseboards, loose plaster, behind bed frames and headboards, beneath beds and furniture, and to bedsprings and bed frames. After removal of bed linens, apply Transport Mikron to mattress and boxsprings. Apply to tufts, edges, seams and folds (do not spray clothes or bed linens). Your may apply it to furniture, but not to areas where there is direct access to seating or arm placements. Infested bed linens should not be treated, but should be removed, placed in sealed plastic bags, and taken for laundering and drying at high temperatures.
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. Bedbugs prefer exposed skin, preferably the face, neck, and arms of a sleeping person.
My husband for 5 yrs had been getting bites on one knee and on his stomach about every other month or so. They are maybe 3 or 4 on stomach area and maybe 6 or 7 on the knee – always same knee and same area on stomach. We wondered about bed bugs so we put DE out, corked all openings and cracks, and sprayed – we have never seen signs of the bed bugs, we put the mattress and box springs in the bed bug proof cover. If it were bed bugs would they not bite some where else and would you not get more of them after all this time? The only bug we have seen are the ones that look like lady bugs sometimes but I understand they do not bite!
To prevent bringing bed bugs to one's own home, travelers are advised to take precautions after visiting an infested site: generally, these include checking shoes on leaving the site, changing clothes in a garage before returning to their home, and putting the used clothes in a clothes dryer outside the house. When visiting a new lodging, it is advised to check the bed before taking suitcases into the sleeping area and putting the suitcase on a raised stand to make bedbugs less able to crawl in. "An extreme measure would be putting the suitcase in the tub." Clothes should be hung up or left in the suitcase, and never left on the floor.  The founder of a company dedicated to bedbug extermination said that 5% of hotel rooms he books into were infested. He advised people never to sit down on public transport; check office chairs, plane seats and hotel mattresses, and monitor and vacuum home beds once a month.
After a few minutes of hot water therapy, use cool water on the bites. You may alternate hot and cool water several times until itching is minimal or gone. Finish with cool water and apply aloes to bites. You will have several hours of relief. My doctor told me the hot water releases the histamine in the skin glands and it tales several hours to refill the glands. About bee stings: I had a extreme reaction to one wasp sting several years ago. Last year I was attacked and suffered over 60+ bites on my face, neck and upper body. I raced into the house and jumped into to shower and opened the hot water full blast.
When staying in a hotel, I check the bed before I bring the suitcase into the sleeping part of the room so that if I have to ask the manager for another room, then I haven't exposed my suitcase to the bugs. When settling in, I put my suitcase up on the suitcase stand or the desktop so that any bugs are less likely to crawl into it. An extreme measure would be putting the suitcase in the tub. If it's a porcelain tub, bed bugs would have a hard time crawling up it. It's also unlikely that they would randomly crawl up a tub, because it's not near the bed. But if I don't see bed bugs in the room when I inspect it, I just put my suitcase on the stand because I know the probability is really low that a bug is going to crawl up the stand and into my suitcase. I keep my clothes in the suitcase or hang them in the closet—I don't leave them on the floor because wandering bed bugs might crawl into them.
Just recently had my first experience w/ bedbug bites in Nicaragua. Hundred plus bites in one night and over a period of three days they became so inflamed, there were tiny blisters on each bite. These suckers snacked on me like I was an all you can eat buffet. I itched 4 days straight and finally went to a pharmacy there, which prescribed me acne creme. Worked, I guess, at least psychologically. But the bites kept festering more and more.
Bedbugs are most often found in hotels, hostels, shelters, and apartment complexes where lots of people come and go. Because bedbugs hide in small crevices, they can hitch a ride into your home on luggage, pets, furniture, clothing, boxes, and other objects. Bedbugs are found worldwide, but are most common in developing countries. Once rare in North America, they may be on the rise due, in part, to increases in international travel.