It is hard to tell if you’ve been bitten by a bed bug unless you find bed bugs or signs of infestation. Most people do not realize they have been bitten until bite marks appear anywhere from one to several days after the initial bite. The bite may look similar to mosquito or a flea bite - a slightly swollen and red area that may itch and be irritating.
Bed bug bites affect everyone differently. Some people may have no reaction and will not develop bite marks or any other visible signs of being bitten. Other people may be allergic to bed bug bites. These allergic symptoms can include enlarged bite marks, painful swellings at the bite site, and, on rare occasions, anaphylaxis. Bed bug bites usually do not pose a serious medical threat.
The best way to treat a bite is to avoid scratching the area and apply antiseptic creams or lotions and take an antihistamine.