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They feed on your blood by piercing the skin and injecting a salivary fluid that causes your blood to flow (an anticoagulant) and they also use anesthetizes to numb your skin so you can't feel them feeding on your blood.

It is that saliva (or rather, the proteins in the saliva) that causes an allergic reaction in most people. The reaction causes redness, swelling, inflammation, and most of all, itchiness around the area of the bite. The redness looks different on different people, and can even vary in appearance depending on the location of the bite on your body. Some people have reported that the bites have a white mark or depression in the center, though that is not always the case. Over time, the shape and the color of the bite/s can change.

Reactions to the bites may be delayed. In fact, in some cases it can be a day or more before the welts appear. Once they appear, the welts shrink down to red spots, but those spots can last for days. It is estimated that around 30% of people do not have a reaction to bed bug bites. No itching, no swelling, nada.

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14y ago

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