Can bed bug bites give an allergic reaction? My arm is covered with red welts and went to ER. Was told it was allergic reaction but friend had bed bug

Bed bugs -itchy bite. I think 'yes' these are from bed bugs. These are insects and so their bites can certainly cause an allergic type reaction, just like a mosquito bite. New York City has a real problem with bed bugs as you might be aware. Hopefully you can avoid contact in the future because you will react the same way (or worse!) as allergy gets worse w/ time. Good to check with a MD for questions, esp. if worsens.