The key bed bug bite symptom to look for is a red, raised bump similar in appearance to a spider or mosquito bite, says Timothy Gibb, Ph.D., a clinical professor of entomology at Purdue University.

Alan H. had been at a South Bronx migrant shelter for three days when he awoke in the middle of the night to find itchy, red bumps on his arms. They were bed bug bites. That morning, March 8, H.

Most people experience this symptom at some point. Itchy bumps can appear due to allergies, infections, insect bites, and, sometimes, unidentified factors. Understanding the different conditions ...